JPS635823B2 - - Google Patents

Description

[Detailed Description of the Invention] A. Industrial Application Field The present invention records and reproduces information signals such as video signals by rotating a thin disc-shaped magnetic sheet at high speed and bringing a magnetic head into sliding contact with the magnetic sheet. The present invention relates to a rotary sheet guiding device used in a magnetic recording/reproducing device.

B. Summary of the Invention The present invention provides a rotary sheet guiding device equipped with a sheet regulating plate disposed to sandwich a rotating seat and facing a magnetic head, the sheet regulating plate having a groove extending in the direction of movement of the magnetic head. By providing this, the sliding arrangement between the magnetic head and the rotary seat is stabilized.

C. Prior Art In general, in a magnetic recording and reproducing device that records and reproduces information signals such as video signals by rotating a thin disc-shaped magnetic sheet at high speed and sliding a magnetic head on this sheet, the magnetic sheet and the magnetic head are used. Unless a stable sliding contact state is achieved, highly reliable recording and reproduction will not be possible.

In particular, since the magnetic sheet is formed into an extremely thin sheet of, for example, about 40 microns, there is a risk that the magnetic sheet will be easily damaged or soiled if left uncovered. Therefore, this type of magnetic sheet is usually housed in a cover body A such as a protective jacket or case, as shown in FIG. The cover body A housing the magnetic sheet C has a window B for abutting the magnetic head.
is opened, and the magnetic sheet C is configured to be exposed to the outside only at the window B.
Therefore, during recording and reproduction, etc., the magnetic sheet C, together with the cover body A, is attached to a recording and reproducing device (not shown), and only the magnetic sheet C is rotated at high speed by a rotating mechanism, and is brought into sliding contact with the magnetic head at the window B. The information signal is recorded or reproduced. In this case, the size of the conventional magnetic sheet C of this type is relatively large. Therefore,
When this sheet C is rotated at a high speed within the cover body _A , as shown in _FIG . Due to the formation of an air film layer due to the air flow as exemplified in , or due to the centrifugal force when the magnetic sheet C itself rotates, the magnetic sheet C
maintains sufficient tension. Therefore, under such conditions, even if the magnetic head D slides into contact with the magnetic sheet C from one side in the uniaxial direction as shown in FIG.
The magnetic sheet C does not escape in the direction away from the magnetic head D due to the pressing force in the _D1 direction, and a stable head sliding state can be easily obtained.

As mentioned above, if the magnetic sheet C is formed into a relatively large sheet body, if the sheet shape is formed into a small diameter, the centrifugal force of the magnetic sheet C itself and the air layer within the cover body A may occur. This is difficult to achieve effectively, and when an attempt is made to bring the magnetic head D into sliding contact from one side of the magnetic sheet C, the magnetic sheet C escapes to the other side opposite to the position of the head D, making it impossible to obtain a stable sliding contact state. I end up.

In order to perform highly reliable recording and playback,
The reality is that the accuracy of the contact between the magnetic sheet C and the magnetic head D is required to be extremely precise, for example, in units of 20 microns.

D Problems to be Solved by the Invention By the way, especially today, there is a strong demand for miniaturization of this type of sheet C, and the size of the entire cover body A should be such that it can be easily placed on the palm of the hand, for example, about 5 cm on one side. In the case of a small-sized magnetic sheet C, the radius of the magnetic sheet C inside the cover body A is only about 2 cm, which is extremely small.
The above-mentioned disadvantage becomes even more noticeable. Therefore,
In order to solve this kind of inconvenience, theoretically, the dimensional accuracy between the upper and lower walls A ₁ and _{A 2 of the} cover body A should be set strictly, and the magnetic sheet C should be Although it is possible to strictly set the positioning, it is difficult to avoid variations in the dimensions of the jacket, which is the cover body A, during manufacture, and this is not practical.
In addition, if we try to avoid the above-mentioned variations in the jacket and improve dimensional accuracy, the disadvantage is that the effort and cost of manufacturing the jacket, which is the cover body A part, will be higher than that of the magnetic sheet C, which is the main part. There is.

The present invention was proposed in view of the above-mentioned conventional circumstances, and is intended to easily realize an extremely reliable contact state between the magnetic sheet and the magnetic head, especially in small magnetic sheet devices, which have been in strong demand recently. The object of the present invention is to easily realize this with a simple configuration without complicating the structure of the magnetic sheet device or increasing the cost.

Furthermore, in order to achieve the above object, the present invention can be achieved by simply applying it to the periphery of the head on the recording/reproducing device side, without adding or improving any special structure to the magnetic sheet device itself. The purpose is to

E Means for Solving the Problems In order to achieve the above-mentioned object, the present invention provides a rotary sheet guide device equipped with a sheet regulating plate disposed to sandwich a rotating seat and facing a magnetic head. A groove extending in the direction of movement of the magnetic head is formed in the plate.

F Effect In the rotary sheet guiding device according to the present invention, since the groove is formed in the sheet regulating plate, the magnetic head can protrude a large amount from the magnetic sheet while allowing the magnetic sheet to approach the sheet regulating plate. can be easily made.

G. Embodiments Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.

G-1 Magnetic Sheet Device Applied to the Device of the Present Invention (FIGS. 2 to 7) First, an example of a magnetic sheet device applied to the device of the present invention will be described with reference to FIGS. 2 to 7.

This rotating magnetic sheet device 1 has a small overall external dimension that can be easily held in the palm of the hand, and a large number of recording tracks are formed on the circumference of a disc-shaped magnetic sheet 3 housed in a jacket 2. It is possible to record and reproduce one still image on one track, and is suitable for use in which the same number of still images as the number of tracks is recorded. The surface of the magnetic sheet 3 is exposed to the outside only at the head sliding contact window 2A of the jacket 2. As shown in FIGS. 4 and 5, the magnetic sheet 3 is formed into an ultra-thin disc shape of, for example, about 40 microns, and has a rotating shaft insertion portion 4 in the center.
are integrally installed. This insertion part 4 is formed by integrally assembling a pair of upper and lower center bosses 5 and 6 made of synthetic resin, and forming a periphery of the center hole 3A of the sheet 3 between the center flange parts 5A and 6A of each boss 5 and 6. metal rings 5 are attached to the tip surfaces 5C and 6C of the shaft portions at both ends.
D, 6D are arranged, and the seat rotation table 2 described later
It is designed to be attracted to the magnet 27C of No.7. The magnetic sheet 3 can perform magnetic recording from the inner track _T1 to the outer track _T0 .

The jacket 2, which rotatably holds the magnetic sheet 3, is constructed by laminating and bonding a bottom plate 2B, a middle plate 2C, and a top plate 2D, as shown in FIG.

That is, each of the plates 2B, 2C, and 2D is formed of a material such as a thin plate-like synthetic resin material so that the outer dimensions thereof are approximately the same.
A stepped hole 7 having a step 7A halfway in the axial direction is formed in the center of the bottom plate 2B, and a notch recess 9 is formed near the center of one side edge 8. A long hole 10 and a small circular hole 11, which constitute the positioning holes 22 and 23 of the jacket 2, are bored on both sides of the jacket 9.

In addition, the middle plate 2C is the bottom plate 2B and the top plate 2D.
The magnetic sheet 3 is laminated in between to hold and form a sheet accommodation gap 12 in the jacket 2, and is therefore sufficiently thicker than the magnetic sheet 3, and has a central portion that has the external dimensions of the magnetic sheet 3. A slightly larger large hole 13 has been opened.
In addition, near the center of one side edge 14 of the middle plate 2C, there is a magnetic sheet exposed in the head sliding contact window 2A formed by the notch recess 9 of the bottom plate 2B and the notch recess 21 of the top plate 2D, which will be described later. A protective arm 15 is formed to protect the outer peripheral edge of 3.
Furthermore, circular holes 16 and 17 are drilled near each corner near the one side edge 14, respectively, and together with the long hole 10 and the small circular hole 11 of the bottom plate 2B, they constitute the positioning holes 22 and 23 of the jacket 2. ing.

Next, the top plate 2D has a stepped hole 19 having a step 19A halfway in the axial direction, and a stepped hole 19 is formed in the center of the side edge 20 so that the front and back sides are symmetrical with the bottom plate 2B. is notch recess 2
1 is opened, and furthermore, near each corner near one side edge 20, a hole 10, a circular hole 16, a small circular hole 11, and a circular hole 17 of the bottom plate 2B and middle plate 2C are used to position the jacket 2. A small circular hole 22 and a long hole 23 forming the holes 22 and 23 are bored.

Then, the jacket 2 is formed by superimposing the middle plate 2C on the bottom plate 2B and the top plate 2D above the bottom plate 2B and joining them together. Note that the above-mentioned void 12 in this jacket 2
A magnetic sheet 3 is installed inside. Then, the central flange portion 5 of the rotating shaft insertion portion 4 of the magnetic sheet 3
A, 6A are in the enlarged diameter hole portions 7B, 19B formed between the enlarged diameter portions of the stepped holes 7, 19, and both end shaft portions 5B, 6B are in the small diameter portion 7C of each stepped hole 7, 19. , 19C, and the magnetic sheet 3 is exposed to the outside only at the head sliding window 2A formed by the notch recesses 9 and 21 of the bottom plate 2B and the top plate 2C. The magnetic head is installed in such a way that it can come into sliding contact with the magnetic head.

G-2 Magnetic recording and reproducing device to which a rotary sheet guide device is applied (FIGS. 1 and 8) Next, a magnetic recording and reproducing device according to the present invention for magnetically recording still images etc. by mounting the above-mentioned magnetic sheet device 1 is shown. An example of a magnetic recording apparatus B to which a rotary sheet guide device is applied will be explained with reference to FIGS. 1 and 8 and the following figures.

The outline of this magnetic recording device B is as shown in FIG. 1.A case cover 26 is attached to a case substrate 25 so as to be openable and closable. and a motor 30, etc., and when recording, the magnetic sheet device 1 is installed, and by closing the case cover 26, the guide plate 31 disposed on the substrate 25 side and the sheet disposed on the case cover 26 side are connected. The adjustment plate 32 stabilizes the contact of the magnetic sheet 3 against the head 28, thereby making it possible to perform highly reliable recording and reproduction.In particular, this device is formed in a small size that can be held in the palm of the hand, and the head Movement operation section 29
By moving the magnetic head 28 one track at a time in the radial direction of the magnetic sheet 3 using a ratchet wheel 33 disposed at the operating end of the magnetic sheet 3, one staple image can be recorded on one track of the magnetic sheet 3. The point is the aim.

That is, in this example, the case board 25 has left and right side walls 25B, 25 on both sides of the plate-shaped main body 25A.
C is formed by rising and bending.

Further, bearing portions 34A, 34B for attaching the case cover are formed in portions near one end of each of the left and right side wall portions 25B, 25C.

Note that the case cover 26 has a plate-like main body 2.
Right and left side walls 26B, 26C are bent on both sides of 6A, and the portions near one end of each of these are pivotally connected to the case base plate 25 at the bearings 34A, 34B. That is, the case substrate 25 and the case cover 26 are connected to the bearing part 3.
4A and 34B are rotatably supported by a pivot shaft 35.

Further, the sheet rotating table 27 pivots and rotates the disk-shaped magnetic sheet 3 of the magnetic sheet device 1.

That is, as shown in FIG. 8, for example, this sheet rotating table 27 has a rotating shaft 27A fitted and supported by the rotating shaft fitting part 4 of the magnetic sheet 3 at the center of the upper end, and this rotating shaft base. An annular magnet 27C is disposed on the peripheral step portion 27B at the end, and is adapted to attract and support the metal ring 5D or 6D of the insertion portion 4. Furthermore, a belt pulley 27D is formed in the middle of the rotary table 27, around which a transmission belt 30A, which is passed around by the drive motor 30, is wound. Then, the pulley 27D and the rotary table base end 27E
and the pedestal support part 3 attached to the case board 25
Bearings 35A and 35B are interposed between the 4 and are rotatably supported.

Further, the tip of the rotating shaft 27 passes through the insertion part 4 when the magnetic sheet device 1 is attached, projects upwardly from the magnetic sheet device 1, and connects with the tip abutting engagement portion 27F of the upper guide mounting plate, which will be described later. Become. Therefore, a sliding means such as, for example, a sphere 27G is disposed on this tip abutting and engaging portion 27F.

The installation height position of the magnetic sheet 3 of the magnetic sheet device 1 is determined by the position of the stepped portion 27B of the sheet rotating table 27.

G-3 Magnetic head (FIGS. 9 and 10) Next, the magnetic head 28 is as shown in FIGS. 9 and 1.
It is formed as shown in Figure 0. Note that although the illustrated example is a three-head system, the invention is not limited to this.

That is, the head 28 attaches the head tip 3 to a head tip support portion 36A formed upright from one end of the head slider 36 formed in a U-shape.
8 is installed. Further, the slider 36 has contact sliding portions 36 on both side edges that contact the guide plate 31.
B and 36C are formed, and further supported on the lower surface by a tip leaf spring 37 of the head moving operation section 29, and biased so that the respective sliding sections 36B and 36C are pressed against the lower guide plate 31.

G-4 Guide plate (Figs. 11 to 13) Furthermore, the guide plate 31 has one side vertical portion 31 that is connected in an L-shape as shown in Figs. 11 to 13.
A and the horizontal part 31 at the upper end of the base end block 31B.
C is integrally formed, and a head protruding window 31D is formed vertically through the center of this horizontal portion 31C. This window 31D is connected to the magnetic head 2.
8 is opened to allow the head tip 38 to protrude so that it can track all the tracks from the innermost track _T1 to the outermost track Tn of the magnetic sheet 3. Further, the horizontal portion 31C serves to regulate the vicinity of the head abutting portion of the magnetic sheet 3 from the lower surface side of the magnetic sheet, and therefore, the surface forms a sheet guide surface 31E having a smooth surface shape. , both side edges 31F and 31G are processed into an arc shape. Further, each sliding portion 36 of the head slider 36 is provided on the lower surface side of the horizontal portion 31C.
Guide surfaces 31H, 3 that slide relative to B, 36C
1I is formed. This guide surface 31H,
31I is parallel to the sheet guide surface 31E.

Further, a pair of positioning pins 31J and 31K are provided on the upper surface side of the base end block 31B of the guide plate 31.
has been planted. These pins 31J, 31K
is a sheet regulating surface 3 of a sheet regulating plate 32, which will be described later, facing a sheet guiding surface 31E of the lower guide plate 31.
Determine the position of 2A.

G-5 Sheet regulating plate (see FIGS. 14 to 18) In addition, the sheet regulating plate 32 provided to face the magnetic head 28 is as shown in FIGS.
As shown in FIG. 5, it is formed as a substantially rectangular plate-like body.

The sheet regulating plate 32 is formed wide enough to regulate the magnetic sheet 3 over the portion of the magnetic sheet 3 that comes into sliding contact with the magnetic head 28 and on both sides of this sliding portion, and It is formed to be large enough to at least cover the range of movement of. Near the center of the sheet regulating surface 02A, which is the lower surface of the sheet regulating plate 32 facing the magnetic head 28, the magnetic sheet 3 is slid onto the magnetic head 28 so as to face the magnetic head protruding window 31D. A concave groove 32B having a semicircular cross section and forming a relief part when the magnetic head 28 makes contact is formed to extend in the moving direction of the magnetic head 28. This concave groove 32B
As shown in FIGS. 14 and 18, the magnetic sheet 3 extends a predetermined distance toward the center from the edge of the magnetic sheet 3 in the peripheral direction to a position slightly closer to the center. The magnetic sheet 3 is formed so as to extend in the radial direction of the magnetic sheet 3, with the portions corresponding to the ends in the outer circumferential direction of the magnetic sheet 3 being closed and the ends in the center direction being open. Then, the sheet regulating surface 3 of this sheet regulating plate 32
2A also has a smooth surface shape, and its both side edges 32C, 3
The 2D portion has an arc shape.

G-6 Installation structure of sheet regulating plate (Fig. 1,
6 to 18) The above-mentioned sheet regulating plate 32 is shown in FIGS.
As shown in FIGS. 6 to 18, the guide plate 3
It is disposed and supported on the case cover 26 side so as to face 1. In this example, the seat regulating plate 32 is mounted on the lower surface of the seat regulating plate mounting plate 40, which is supported so as to be movable up and down by locking pins 41A, 41B, 41C, and 41D planted and suspended from the main body portion 26A of the case cover 26. attached. Further, a tip 42B of a leaf spring 42 whose base 42A is fixed to the case cover 26 is pressed against the sheet regulating plate 32 and urged downward along each of the pins 41A to 41D, that is, in the direction of the guide plate 31. Further, the sheet regulating plate mounting plate 40 has a distal end portion 40A that protrudes beyond the sheet regulating plate 32, and the distal end abutting engagement portion 2 of the rotating shaft 27A.
It is adapted to abut and engage with 7F.

There is a slight gap between the sheet regulating plate 32 and the guide plate 31 on both the upper and lower sides of the magnetic sheet 3 when the sheet regulating plate 32 and the guide plate 31 adjust the position from both upper and lower sides so as to sandwich the magnetic sheet 3. However, the positional relationship between the sheet regulating plate 32 and the guide plate 31 is such that the sheet regulating plate 3
2 engage and abut, and at the same time, the upper guide mounting plate 40 engages and abuts the tip end abutting engagement portion 27F of the rotating shaft 27A. The positions of the sheet regulating plates 32 are adjusted at intervals.

G-7 Head movement operation unit (FIG. 19) Next, the head movement operation unit 29 moves the magnetic head 28 in the radial direction of the magnetic sheet 3 and moves the magnetic head 28 to the innermost track of the recording track on the magnetic sheet 3.
This is a member for performing a tracking operation from _T1 to the outermost track Tn.

In the example shown in FIG. 19, the leaf spring 37 is attached to the tip of the L-shaped head moving arm 43, which is rotatably supported by a pivot shaft 44 whose midway portion is mounted on the case base plate 25. The head slider 36 is attached via the head slider 36. Further, the base end of the movable arm 43 is abutted and engaged with an engagement shaft 47 mounted on a ratchet 46 that is rotatable around a ratchet shaft 45. It is meshed with a pinion 48 that is integrated with the ratchet wheel 33, and rotates around the ratchet shaft 45 by rotating the ratchet wheel 33, thereby moving the engaging shaft 47 around the ratchet shaft 45. Arm 4
3 can be rotated around a pivot shaft 44. Therefore, the ratchet wheel 33 has, for example, an outer peripheral edge protruding outward from the case so that it can be rotated easily from the outside of the case. In addition, 49 is the moving arm 4
3, in FIG. 19, this is a tension spring for pulling back the rotation around the pivot shaft 44 in the clockwise direction.

Further, 50A and 50B are jacket positioning pins planted on the case substrate 25, and are inserted into the positioning holes 2 of the jacket 2 of the magnetic sheet device 1.
It engages with B and 2C.

G-8 Magnetic sheet rotation operation state (FIGS. 17 and 18) Therefore, in order to attach the magnetic sheet device 1 to the recording device having the above configuration, open the case cover 26 and insert the positioning hole 2B of the jacket 2. 2C is fitted to the positioning pins 50A and 50B, and the rotating shaft 27A of the seat rotating table 27 is inserted into the rotating shaft insertion portion 4. In this state, the portion of the magnetic sheet 3 exposed within the head sliding contact window 2A of the jacket 2 is fitted onto the sheet guide surface 31E of the guide plate 31.
Then, the magnetic sheet device 1 loaded in this way
When the case cover 26 is closed to cover the top, the sheet regulating plate 32 faces the head sliding contact window 2A of the jacket 2 from above, and the regulating surface 32A comes into contact with the magnetic sheet 3 portion within the window 2A.
At this time, the sheet regulating plate 32 abuts and engages with the positioning pins 31J and 31K set up from the guide plate 31 side, and therefore the position of the seat regulating plate 32 is set with the guide plate 31 side as a reference. It will be supported accurately at the interval position. Also,
When the magnetic head 28 is in sliding contact with the magnetic sheet 3, the area around the sliding contact portion of the head is the same as the sheet guide surface 3 of the sheet regulating plate 32 and the guide plate 31.
1E and the regulating surface 32A, it is positioned so as to be held between the vertical direction.

Since a groove 32B is formed on the regulation plate 32 at a position facing the magnetic head 28, the magnetic head 28 can slide into the magnetic sheet 3 so as to protrude into the groove 32B. Become. Therefore, while increasing the protrusion amount of the magnetic head 28 with respect to the magnetic sheet 3, the magnetic sheet 3 and the sheet regulating surface 32A of the sheet regulating plate 32 are
The distance between the two can be reduced. Since the distance between the magnetic sheet 3 and the sheet regulating surface 32A can be reduced in this way, the magnetic sheet 3 with a small diameter
Even when using the magnetic sheet 3, an air film, which is an air flow, is easily formed between the magnetic sheet 3 and the sheet regulating surface 32A when the magnetic sheet 3 is driven to rotate. The action of this air film ensures stable sliding contact between the magnetic head 28 and the magnetic sheet 3.

Furthermore, since the concave groove 32B provided in the sheet regulating plate 32 is formed by closing a portion corresponding to the outer peripheral edge of the magnetic sheet 3, the center bosses 5 and 6 are attached and the groove is placed on the sheet rotating table 27. The outer peripheral edge portion of the magnetic sheet 3, which has lower rigidity than the inner peripheral side where the magnetic sheet 3 is placed and which tends to swing significantly in the vertical direction during rotational operation, is regulated by a sheet regulating surface 32A that closes the groove 32B. Therefore, the magnetic head 28 largely protrudes toward the sheet regulating plate 32 and comes into sliding contact with the magnetic sheet 3.
Even if the magnetic sheet 3 is greatly bent, the outer peripheral edge portion of the magnetic sheet 3, which tends to swing vertically, can be reliably supported and regulated to prevent so-called flapping during rotation. On the other hand, since the portion of the concave groove 32B corresponding to the center side of the magnetic sheet 3 is open as described above, the magnetic head 28 greatly bends the magnetic sheet 3 toward the sheet regulating plate 32 while holding the magnetic sheet 3. 3, the magnetic sheet 3 is prevented from coming into contact with the sheet regulating plate 32 on the central side, and an air film is formed between the magnetic sheet 3 and the sheet regulating plate 32. A stable sliding contact state can be obtained using this method. Then, when the magnetic head 28 reaches the center side of the magnetic sheet 3 and bends the magnetic sheet 3, this magnetic sheet 3
The outer periphery of the groove, which tends to swing, is greatly bent and becomes prone to flapping, but as mentioned above, the groove 3
The sheet regulating surface 32A that closes the sheet regulating surface 2B reliably supports and regulates the sheet, thereby preventing so-called flapping during rotation. Therefore, the magnetic head 28 is connected to the magnetic sheet 3.
The magnetic head 28 is moved over a wide area on the inner and outer peripheries of the magnetic sheet 3, and even when the magnetic head 28 reaches a position inside or outside the magnetic sheet 3, stable sliding is achieved using an air film against the magnetic sheet 3. Since it is possible to obtain a contact state, the magnetic sheet 3
It becomes possible to use a wide area of the inner and outer peripheries as a signal recording area.

In addition, in the above-mentioned example, the concave groove 32B is
Although it is formed to have a semicircular cross section, any suitable shape may be adopted as long as it can ensure the protrusion of the magnetic head 28.

H. Effects of the Invention As described above, the rotary seat guiding device according to the present invention closes the concave grooves provided on the sheet regulating plate on the outer peripheral edge side of the rotary seat and opens them on the center side, so that the magnetic head The magnetic head is moved over a wide area on the inner and outer peripheries of the rotary seat, and even when the magnetic head reaches a position inside or outside of the rotary seat, the air film is used to ensure stable sliding against the rotary seat. Since it is possible to obtain a contact state, it becomes possible to utilize a wide area on the inner and outer peripheries of the rotary seat as a signal recording area. Therefore, the rotary seat can be used effectively and a sufficiently large signal recording capacity can be secured even with a small rotary seat.

Further, the sheet regulating plate constituting the rotary sheet guiding device according to the present invention is arranged without moving together with the magnetic head, covers the rotary sheet over the movement range of the magnetic head, and covers both sides of the sliding portion of the magnetic head. Since the rotary seat is regulated by covering a wide area, it is possible to maintain stable sliding contact between the rotary seat and the magnetic head without applying a large load to the rotary seat in a small device that rotates the rotary seat at high speed. can be maintained.

[Brief explanation of the drawing]

FIG. 1 is a schematic external perspective view of a recording apparatus to which a rotary sheet guiding device according to the present invention is applied. FIG. 2 is an external perspective view showing an example of a magnetic sheet device applied to the device of the present invention, FIG. 3 is a plan view thereof, FIG. 4 is a perspective view of the magnetic sheet portion, and FIG. 6 is an exploded perspective view of the jacket, and FIG. 7 is a sectional view of the magnetic sheet device. FIG. 8 is an enlarged sectional view of the seat rotating table, FIG. 9 is an enlarged perspective view of the magnetic head, FIG. 10 is an enlarged front view of the magnetic head and guide plate, and FIG. 11 is an enlarged front view of the magnetic head and guide plate. is a left external perspective view showing the guide plate, FIG. 12 is a right external perspective view thereof, and FIG. 13 is a front view thereof. FIG. 14 is a perspective view seen from below the sheet regulating plate, and FIG. 15 is a cross-sectional view thereof. FIG. 16 is an enlarged perspective view showing the relative relationship between the sheet regulating plate and the guide plate, FIG. 17 is an enlarged longitudinal sectional front view showing the position regulating state of the magnetic sheet, and FIG. 18 is a longitudinal sectional side view thereof. FIG. 19 is a schematic plan view for explaining the head movement operation section. FIG. 20 is a diagram illustrating a conventional magnetic sheet device,
FIG. 21 is an enlarged cross-sectional view showing a part of the magnetic sheet device, and FIG. 22 is a partially schematic side view showing the state of sliding contact with the magnetic head. It is a diagram. 1... Magnetic sheet device, 2... Jacket, 3
...Magnetic sheet, 28...Magnetic head, 31...
Guide plate, 32... upper guide plate which is a sheet regulating plate, 32A... regulating surface, 32B... concave groove.

Claims (1)

[Scope of Claims] 1. In a rotary sheet guide device including a sheet regulating plate disposed to face a magnetic head with a rotary seat in between, the magnetic head is disposed on the sheet regulating plate at a position facing the magnetic head. A groove extending in the direction of movement is formed, and the groove is formed from a circumferential edge of the rotary seat to a position that is a predetermined distance toward the center from a position closer to the center. A rotary sheet guiding device characterized in that a directional end is open.