JPS6213743B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cassette-type magnetic sheet recording/reproducing device suitable for recording or reproducing video signals mainly corresponding to still images, etc., and particularly relates to a top cover and a cassette mounting plate. The rotary operation of the cassette mounting plate of the magnetic sheet cassette mounting section consisting of the above is made in conjunction with the upper lid, thereby making it impossible to press only the cassette mounting plate, thereby protecting the magnetic head attached to the main body of the apparatus. In addition, the magnetic sheet can be loaded into the main body of the apparatus by simplifying the loading operation and ensuring accurate positioning.

First, an example of a magnetic sheet cassette that can be attached to and removed from a cassette type magnetic sheet recording/reproducing apparatus according to the present invention will be briefly described.

FIG. 1 is a perspective view showing a magnetic sheet cassette as an example of the magnetic sheet cassette. In the figure, reference numeral 1 indicates the sheet cassette as a whole, which includes a substantially rectangular upper plate 2 made of a transparent thin plate such as acrylic resin.
a and the lower surface plate 2b and a spacer plate 3 with a similar outline to be inserted between them are joined and integrated, and a thin circular chamber 4 is formed by hollowing out the spacer plate 3 at a position near the left side (front part). The chamber has a structure in which a well-known disk magnetic sheet 5 is housed, and at the intersection of the longitudinal centerline Y of the cassette 1 and the widthwise centerline The magnetic sheet 5 has an escape hole 6 having a diameter, and the center portion of the magnetic sheet 5 is exposed within this escape hole. Reference numeral 7 indicates a fitting hole formed in the center of the sheet for fitting the magnetic sheet 5 to a rotating hub to be described later.

Further, the seat cassette 1 of this example has a V-shaped cut 8a and a trapezoidal engagement groove, which are engaged with an engagement pin for positioning on the apparatus main body side, at symmetrical positions on the rear edge of the seat cassette 1 in the final setting. It has a cut 8b, and is provided with a temporary fixing notch 9 which is temporarily fixed at the initial stage of the loading operation, parallel to and adjacent to the other end which is the rear edge, and located symmetrically on both sides of the Y axis.
Further, both side surfaces of one end of the cassette 1 near the front end are sloped portions 10 having the same angle. In the figure, reference numeral 11 indicates a magnetic head insertion hole formed as a long hole on the upper and lower surfaces of the cassette along the Y axis in the chamber 4, and 12 indicates a magnetic head insertion hole 11 on the upper and lower surfaces.
13 small intake holes for multiple holes drilled on each side of the
indicates ventilation holes provided at equal angular positions on the inner peripheral portion of the chamber 4.

By the way, when attempting to attach a magnetic sheet cassette as described above to a cassette-type magnetic sheet recording and reproducing device, for example, it is troublesome to center the magnetic sheet stored in the cassette, and due to this, the loading mechanism There are problems such as the complication of the magnetic sheet and the tendency for relative misalignment between the mounting position of the cassette and the rotational position of the magnetic sheet.

Furthermore, since the cassette mounting plate on which the cassette is mounted can be rotated freely by itself, the magnetic head may be pressed by the cassette without secure positioning, causing damage to the magnetic head. There is also a danger of doing so.

Furthermore, since the loading mechanism is complicated, the loading operation of the cassette containing the magnetic sheet is also complicated, making it difficult to provide it to the general public as a consumer device.

Therefore, the present invention makes it possible to load the cassette with a simple operation, to ensure accurate positioning, and to load the cassette into the main body of the device.In addition, to protect the magnetic head, the cassette is In order to prevent the pressing operation of the cassette mounting plate on which the cassette is placed, a release claw is provided on the base of the device body that engages with a locking protrusion that projects from the cassette mounting plate and projects from the top cover. A stopper member is disposed that can be released from engagement with the locking protrusion by only a single push.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The cassette-type magnetic sheet recording and reproducing apparatus according to the present invention and the loading and unloading of a magnetic sheet cassette into the apparatus will be described below with reference to the drawings.

FIG. 2 is a plan view showing an example of a cassette type magnetic sheet recording/reproducing apparatus according to the present invention. In the figure, 20 is the entire recording/reproducing device, 21 is a base on which a mechanism for driving the magnetic head 22, which is the main mechanical part of this device, a drive motor 23, etc. are attached, and 24 is a base as shown in FIG. It is a rectangular upper lid with a plate-shaped cassette restraining spring 25 attached to one inner side surface, which presses and supports the cassette 1 shown in FIG. . The magnetic head 23 is attached via a head holding plate 27, and is click-shifted in the direction of the arrow by a cam mechanism (not shown) at a predetermined pitch, that is, a pitch corresponding to one recording track formed on the magnetic sheet 5. be done.

That is, in the device of this example, when a cassette is installed, which will be described later, the magnetic head chip 22 comes into contact with the magnetic film surface of the magnetic sheet 5 through the magnetic head insertion hole 11 of the cassette 1, and the relative relationship between its displacement and the rotation of the magnetic sheet is determined. Then, a concentric recording track is drawn on the surface of the magnetic sheet, or a reproduction signal is extracted from the recording track.

Next, main members constituting the present invention will be explained with reference to the drawings. FIG. 3 is a perspective view showing the above-mentioned upper lid 24. At the center of the inner surface of the upper lid 24, as shown in FIG. 5 and FIG. A sheet holder that tightly holds the magnetic sheet 5 together with a centering hub 29 that is rotated by a drive motor 23 and has a tapered protrusion 28 at the tip that fits into the fitting hole 7 of the magnetic sheet 5. 30 is rotatably attached via a bracket 32 attached by screws 31. Four cassette holding springs 33 are attached to surround the sheet holding down 30 and press and support the cassette 1. These cassette restraining springs 33 are constructed with leaf springs, and have a curved tip 34 and a proximal end 35.
It is attached by being inserted into an insertion hole 36 formed in the inner circumferential surface of the upper lid 24, and is inclined rearward from the insertion side of the cassette 1 to facilitate insertion of the cassette 1. In addition, a concave cassette ejecting portion 37 is formed at the front of the insertion side of the cassette 1, from which a part of the cassette 1 faces when ejected.
A front wall 38 extends so as to completely enclose the front wall 38. Further, on both sides of the rear side facing the cassette ejecting part 37, there are support shafts that relatively engage with first U-shaped recesses 40 formed at the tips of the two support plates 39 set up on the base 21. A projecting piece 43 is formed perpendicularly to the support shaft 41 and has a through hole 42 for attaching one end of a biasing spring to be described later. In front of the central portion on both sides of the upper lid 24, a cassette mounting plate 2, which will be described later, is provided.
A long hole 4 that is engaged with an engaging pin protruding from both sides of 6.
As will be described later, a release pawl 46 of a stopper member for releasing a stopper member that prevents the pressing operation of only the cassette mounting plate 26 is formed to protrude so as to hang down. Note that an engagement pin 48 that engages with a latch 47 that is rotatably supported by the base 21 is provided protruding from the tip of the tongue piece 45 .

By the way, the latch 47 that this engagement pin 48 engages is attached to the mounting plate 101 that is attached to the base 21.
It is rotatably supported via a support shaft 92 erected on the support shaft 92, and is rotatably biased in the direction of arrow B in FIGS. 7 and 8 by a torsion coil spring 91 attached via the support shaft 92. It is being

FIG. 4 is a perspective view showing a cassette mounting plate 26 interposed between the upper lid 24 and the base 24, which interlock with the upper lid 24 after a certain delay time. A through hole 49 through which the center ring hub 29 faces is bored in the center of the cassette mounting plate 26, and a through hole 49 for sliding on the surface of the magnetic sheet 5 is provided near the through hole 49 at the front of the cassette insertion side. A head insertion hole 50 is drilled through which the magnetic head chip 22 in contact faces. The head insertion hole 50 is formed to be at least larger than the amount of movement of the magnetic head tip 22. These through holes 49
At the periphery of the head insertion hole 50, insertion holes 52 are bored, into which four positioning pins 51, which are set on the base 21 and which position the cassette in the height direction during loading, are inserted. An insertion hole 55 is formed through which an operating piece 54 of a micro switch 53 for switching the drive motor 23 of the centering hub 29 and an operating piece for switching a circuit section (not shown) for recording, reproducing, etc. are exposed. In front of the insertion side of the cassette 1, there is a cassette insertion opening 5 which is enlarged between the upper cover 24 and the upper cover 24 when the cassette 1 is ejected.
6, and a cassette ejecting portion 58 of the same shape opposite to the cassette ejecting portion 37 of the upper lid 24 is provided at the center of the inclined portion 57.
is formed. On both sides of the rear end facing the inclined portion 57, a lower portion is formed at the tip of the support plate 39 that is set up on the base 21, inward of the first U-shaped recess 40 and close to the base 21. A support shaft 60 is provided to protrude and relatively engage with the second U-shaped recess 59 .

Inside the cassette mounting plate 26, on the rear side from which the support shaft 60 projects, a cassette retainer 62 is attached which resiliently supports one end 1a of the cassette 1 when the cassette is mounted. This cassette retainer 62 is inserted into a long hole fitting hole 63 having a large diameter portion at one end, and is slidably fitted onto the cassette mounting plate 26 via a fitting groove 64 formed around the circumference thereof. be done. The cassette retainer 62 is attached to a protrusion 65 protruding from the cassette mounting plate 26, and one end 66 abuts against a rear wall 67 formed at one end of the rear side of the cassette mounting plate 26, so that the cassette retainer 62 is pushed forward on the cassette insertion side. It is resiliently supported by a spring 68 that can be energized. Further, the proximal end of the inclined portion 57 on the front side which is the cassette insertion side opposite to the cassette retainer 62, that is, the cassette mounting surface 69 and the inclined portion 5
Engaging protrusions 70 are formed on both sides near the boundary with the cassette 1 to engage with temporary fixing notches 9 formed on both sides of the cassette 1. Further, on both sides of the inclined portion 57, there are insertion holes through which engagement pins 72 for positioning are inserted, which are set up from the base 21 and engage with the V-shaped cut 8a and the trapezoidal cut 8b, which are the engagement grooves of the cassette 1 during loading. 73 is drilled.

Further, on both sides of the cassette mounting plate 26, a seventh
As shown in FIG. 8 and FIG. 8, an engaging pin 74 is protrudingly provided to engage with a long hole 44 formed in a tongue piece 45 that hangs down from both sides of the upper lid 24. A locking portion 7 formed on one side of the upper end of the mounting plate 101 attached to one side of the base 21
A locking protrusion 79 that relatively engages with 8 is provided in a protruding manner.

Further, a stopper member 77 is mounted on the mounting plate 101 via the support shaft 76, and is in relative contact with a locking protrusion 79 protruding from the cassette mounting plate 26 to restrict the lowering operation of only the cassette mounting plate 26. installed. This stopper member 77 is connected to the support shaft 7.
The torsion coil spring 75 attached through the cassette mounting plate 26 is biased to rotate in the direction of the arrow A in FIGS. Abutting and engaging. On one side of the upper end of the stopper member 77 is a release claw 46 provided on the upper lid 24 when the upper lid 24 is rotated.
A rotation operation piece 80 that is pressed by is provided extending obliquely upward. Therefore, the stopper member 77 is rotated in the direction of arrow A in FIG. 7 against the biasing force of the torsion coil spring 75 when the rotation operation piece 80 is pressed by the release claw 46 of the upper lid. The locking protrusion 7 of the cassette mounting plate 26 is rotated.
It will now escape from the rotation trajectory range of 9.

In addition, the base 2 is attached to the support shaft 84 which is planted on the tongue piece 85 attached near the support shaft 60 of the cassette mounting plate 26.
The other end of a toggle spring 83, one end of which is attached to a support shaft 82 protruding from 1, is locked. By attaching the toggle spring 83 in this way, the cassette mounting plate 26 can be mounted on the base 2 with the support shaft 60 as the center.
1 and is biased to rotate in the opening direction, which is the direction away from the opening.

In addition, on both sides near the support shaft 60, bases 2
1, one end of which is attached to a support shaft 81 that protrudes from the base 21, and the other end of a conventionally known toggle spring 83 is attached to a support shaft 82 that also projects from the base 21. 85 is formed.

The upper lid 24 and the cassette mounting plate 26 constructed as described above are attached to the base 21 as shown in FIGS. 5 to 8 to constitute the recording/reproducing apparatus 20.

That is, the upper lid 24 has a support shaft 41 connected to the first U formed at the tip of the support plate 39 that is set on the base 21.
The cassette insertion port 56 is urged to open by a biasing spring 86 that engages with the letter-shaped recess 40 and has one end attached to the base 21 and the other end locked in the through hole 42 of the projecting piece 43. It is attached to a base 21. The cassette mounting plate 26 has a support shaft 60 engaged with a second U-shaped recess 59 formed in the support plate 39, and the other end of the toggle spring 83 attached to the base 21 is attached to the support shaft 84, and further The engagement pin 74 is engaged with the elongated hole 44 of the tongue piece 45 of the upper lid 24, and the locking protrusion 79 is relatively engaged with the locking portion 78 of the mounting plate 101, thereby being attached to the base 21.

The cassette mounting section constructed as described above and attached to the base 21 and composed of the upper cover 24 and the cassette mounting plate 26 is used to load or unload the cassette 1 as shown in FIG. This will be explained with reference to FIGS. 5 to 8.

First, as shown in FIGS. 5 and 7, the upper lid 24 and the cassette mounting plate 26 are
1 and a toggle spring 83 installed between the cassette mounting plate 26 and the base 21, the lid is opened upward in the figure, and the upper lid 24 and the cassette mounting plate are opened upwardly in the figure. The cassette 1 is inserted in the cassette insertion state in which the cassette insertion opening 56 formed by the inclined portion 57 of the cassette 26 is open. When inserting this cassette 1, place the cassette mounting plate 2
The engagement protrusion 7 formed on the placement plate 26 is inserted into the temporary fixing notch 9 formed on both sides of the cassette 1 by sliding it on the cassette 1.
0. Then, the cassette 1 is temporarily fixed on the cassette mounting plate 26 with one end 1a pressed and supported by the cassette retainer 62 which is biased by the coil spring 68.

As mentioned above, place the cassette 1 on the cassette mounting plate 2.
6, the top cover 24 is pressed from above in the figure until the engagement pin 48 of the top cover 24 engages with the engagement recess 93 of the latch 47. Then, first, the magnetic sheet 5 built into the cassette 1 is housed in the centering hub 29, and the operating piece 54 of the micro switch 53, which is exposed through the insertion hole 55 of the cassette mounting plate 26, is pressed and the drive motor 23 is turned on. Centering hub 29
rotates, and the magnetic sheet 5 comes to be housed in the center of the hub 29. At the same time, positioning pins 51 are installed on the base 21 in correspondence with the four insertion holes 52 formed in the cassette mounting plate 26, respectively.
comes into contact with one side of the cassette 1, and as shown in FIG. Then, one end 1a of the cassette 1 is pressed by the cassette retainer 62, and the cassette 1 is slid in the direction of the positioning engagement pin 72 by the width of the arrow A in FIG. and trapezoidal cut 8b are engaged with each other. Then, the cassette 1 is attached to the positioning pin 51.
The cassette 1 is then positioned in the height direction, and the engaging pin is relatively engaged with the V-shaped cut 8a and the trapezoidal cut 8b, thereby being positioned in the longitudinal and radial directions, and the cassette 1 is loaded.

The interaction between the upper cover 24 and the cassette mounting plate 26 will be described below. When the upper lid 24 is pressed, the cassette mounting plate 26 will not rotate until the engagement pin 74 engaged with the elongated hole 44 of the tongue piece 45 of the upper lid 24 comes into contact with the upper edge of the elongated hole 44 in the figure. It is blocked. That is, after the upper cover 24 has rotated by the amount of clearance of the elongated hole 44, the cassette mounting plate 26 begins to rotate. Accordingly, the release claws 46 formed on both sides of the upper lid 24 rotate the stopper member 77 in the opposite direction of arrow A in FIG. The contact between the locking portion 78 and the locking portion 78 is released. Cassette mounting plate 26
is rotated by the toggle spring 83 to the cassette loading position, which is the lower position in the drawing, and the cassette 1 is positioned as described above. When the upper cover 24 is further pressed, the engagement pin 48 is locked into the latch 47.
The upper lid 24 is closed by engaging with the engaging recess 93 of the upper lid 24. At this time, the magnetic sheet 5 is clamped by the sheet retainer 30 attached to the upper lid 24 and the centering hub 29. In particular, since a magnet 95 is embedded in the centering hub 29, it can be clamped securely.

To explain the case of ejecting the cassette 1 that has been installed in reverse, the upper lid 24 is further pressed in the cassette installed state shown in FIGS. 6 and 8.
When the top cover 24 is pressed, the latch 47 and the engagement pin 4
8 is disengaged, and the upper lid 24 and the cassette mounting plate 26 are raised by the urging spring 86 and the toggle spring 83 to be in an open state.

That is, when the top lid 24 is pressed, this top lid 2
At the same time as the engaging pin 48 engaged with the engaging recess 93 of the latch 47 provided in the latch 4 descends in the engaging recess 93, the latch 47 is rotated by the torsion coil spring 91 in the direction of arrow B in FIG. be moved.
The engagement pin 48 is connected to the engagement recess 93.
The distal end abuts a protrusion 96 provided to protrude inward, and the engagement with the engagement recess 93 is released.

By the way, the protruding piece 96 that disengages the engaging pin 48 from the engaging recess 93 is bent so that its tip protrudes toward the front in FIG. 8, which is the protruding direction of the engaging pin 48. The latch 47 provided with the protruding piece 96 is mounted so as to be flexible or slightly movable about the shaft 92.
When the upper lid 26 is further pushed up during ejection, the engagement pin 48 descends from the state shown in FIG. 9A in the direction of arrow C in the same figure to the state shown in FIG. 9B. At this time, the latch 47 is connected to the torsion coil spring 9.
1, the engaging pin 48 and the protruding piece 96 are in a corresponding state. When the upper lid 24 is released from being pressed down,
The upper lid 24 is raised toward the opening side by the urging force of the urging spring 86 and the toggle spring 83. At this time, the engagement pin 48 presses the protrusion 96 toward the front in FIG. 8 as shown in FIG.
7 and disengages from the latch 47, allowing the upper lid 26 to rise. At this time, the cassette mounting plate 26 holds the engagement bin 74 against the upper lid 2.
Since the engagement pin 74 is engaged with the elongated hole 44 of No. 4 and associated with the upper cover 24, the engagement pin 74 is delayed by the time it takes to move within the elongated hole 44. Therefore, first, after the sheet retainer 30 provided on the upper lid 24 is separated from the magnetic sheet 5, the cassette mounting plate 26 is lifted up and the cassette 1 is removed from the positioning pin 51. Furthermore, since the cassette 1 has already come off the engagement protrusion 70, it is lifted up while being pressed against the engagement pin 72 by the force of the cassette retainer 62, and when it is completely detached from the engagement pin 72, it is wound on the cassette retainer 62. The cassette insertion slot 5 is closed by the spring 68.
The eject is completed by jumping outward from 6.

Then, the rotation operation piece 80 of the stopper member 77 of the cassette mounting plate 26 is rotated by the release claw 46 provided protruding from the upper lid 24, and the engagement state between the locking protrusion 79 and the locking portion 78 is adjusted. Rotation cannot be performed unless it is released. That is, the cassette mounting plate 26 is rotated only in relation to the upper lid 24.

According to the apparatus according to the present invention as described above, the cassette can be loaded or unloaded simply by pressing the upper lid in which the cassette is built, so the operation is extremely easy and the structure can be extremely simplified.

In particular, since the cassette is temporarily fixed on the cassette mounting plate and then positioned and then loaded, loading can be performed accurately and safely. This is because the cassette mounting plate, which operates in conjunction with the top cover, starts operating after a certain delay time, and is also extremely effective for protecting the magnetic head. Furthermore, since the cassette mounting plate cannot be rotated independently, there is no possibility of inadvertently pressing the magnetic head, which is extremely effective in protecting the magnetic head.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of a magnetic sheet cassette installed in the device of the present invention, FIG. 2 is a plan view showing a cassette type magnetic sheet recording/reproducing device to which the present invention is applied, and FIG. FIG. 4 is a perspective view of the upper lid constituting the apparatus, and FIG. 4 is a perspective view of the cassette mounting plate. FIG. 5 is a side sectional view showing the inside of the apparatus with the cassette temporarily fixed on the cassette mounting plate, and FIG. 6 is a side sectional view showing the cassette installed. FIG. 7 is a side view of the device according to the present invention showing when the cassette insertion slot is open;
FIG. 8 is a side view of the cassette device. 9A, B, C, and D are front views showing the state in which the engagement pin is released from the latch. 1... Sheet cassette, 5... Magnetic sheet, 8
a...V-shaped cut, 8b...trapezoidal cut, 9...
Notch for temporary fixing, 21...Base, 22...Magnetic head, 24...Top lid, 26...Cassette mounting plate,
33...Cassette holding spring, 44...Long hole, 45
... tongue piece, 46 ... release claw, 47 ... latch, 5
1...Positioning pin, 62...Cassette retainer, 7
0... Engaging projection, 72... Engaging pin, 74... Engaging pin that engages with the long hole 44, 77... Stopper member, 79... Locking projection, 80... Rotating operation piece, 8
3... Totsugurubane.

Claims (1)

[Scope of Claims] 1. A top lid and a cassette mounting plate that are rotatably attached to a base in conjunction with each other, and that engage with a locking projection protruding from the cassette mounting plate, disposing on the base a stopper member that is released from engagement with the locking protrusion when the upper lid is lowered by a release claw formed on the upper lid;
A cassette type magnetic sheet device in which only the cassette mounting plate cannot be rotated.