JPH0633531Y2 - Magnetic recording / reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a magnetic recording / reproducing apparatus for recording / reproducing various data on / from a magnetic disk, and more specifically, a magnetic head whose insertion end accompanies insertion of a cassette into a cassette holder. The present invention relates to a cassette support structure for a cassette holder that prevents the contact with the cassette holder.

[Prior Art] In a conventional magnetic recording / reproducing apparatus, as shown, for example, in Japanese Utility Model Laid-Open No. 62-26662, a jacket guide mechanism includes a jacket guide member, a bracket, a pin, a leaf spring, a screw and a height adjusting screw. It consists of a total of 6 parts and is attached to the lower surface of the clamp arm to prevent the tip of the jacket from coming into contact with the magnetic head guided by the jacket guide member when the jacket is inserted, and to rotate the clamp arm after inserting the jacket. Along with this, the jacket guide member is moved so as to be separated from the front end of the jacket, and the magnetic head is brought into contact with the magnetic disk in the jacket.

[Problems to be Solved by the Invention] However, the above-mentioned jacket guide mechanism has a problem that the structure itself becomes complicated and the apparatus itself becomes thick and large because it is composed of a total of 6 parts. is doing.

Further, since the above-mentioned jacket guide mechanism is attached to the lower surface of the clamp arm, a space is required in the device itself to allow the jacket guide mechanism to move with the rotation of the clamp arm, and the width of the device becomes large. Also has

[Object of the Invention] In view of the above-mentioned conventional drawbacks, an object of the present invention is to utilize a part of a cassette holder that holds a cassette and a magnetic head even when the distance between the magnetic head and the magnetic disk is set to a minimum. It is an object of the present invention to provide a magnetic recording / reproducing apparatus capable of preventing contact with a cassette, reliably and smoothly inserting a cassette, and thinning and downsizing the apparatus.

[Means for Solving the Problems] Therefore, according to the present invention, there are provided an upper position where a cassette in which a magnetic disk is rotatably accommodated can be inserted and ejected, and a lower position where a magnetic head is brought into contact with the magnetic disk. In a magnetic recording / reproducing apparatus which has a cassette holder movable between and which records and reproduces various data on the magnetic disk, when a cassette is inserted into the cassette holder, an insertion end of the cassette is separated from the magnetic disk. The guide member for restricting contact with the magnetic head is a guide protrusion formed by denting a part of an upper plate of the cassette holder located near the magnetic head toward the inside of the cassette holder.

[Advantage of the Invention] Since the present invention is configured as described above, when the insertion end of the cassette is inserted into the cassette holder moved to the upper position with the insertion end facing upward, the cassette is not The guide projections provided in the vicinity correct the insertion posture so that the insertion posture is substantially horizontal to prevent the insertion end of the cassette from coming into contact with the magnetic head. As a result, even when the distance between the magnetic head and the magnetic disk is minimized, the cassette can be reliably and smoothly inserted into the cassette holder, and the device can be made thin and compact. .

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an exploded perspective view of a magnetic recording / reproducing apparatus according to the present invention,
FIG. 2 shows the assembled magnetic recording / reproducing apparatus, which is labeled A- in FIG.
FIG. 3 is a vertical cross-sectional view corresponding to line A, in which a frame 3 of the magnetic recording / reproducing apparatus 1 is integrally formed with a pair of facing side plates 5, and front and rear sides of each side plate 5 are guide grooves 7 as guide portions facing vertically. Are formed. A rotating body 9 connected to an electric motor (not shown) by a DC motor or the like in front of the frame 3.
Is rotatably supported, and the rotating body 9 is rotated in a required direction by driving the electric motor. In addition, the rotating body 9
An engaging pin 9a is provided on the cassette holder 45, which will be described later.
When it is moved to the lower position, it engages with the hub portion (not shown) of the magnetic disk 13 (shown by a broken line in FIG. 1) rotatably accommodated in the cassette 11 inserted in the cassette holder 45. The pin 9a is engaged. A support frame 15 having standing walls in front and back is attached to the rear of the frame 3, and two guide shafts 17 having an axis line in the front-rear direction are laterally mounted on the support frame 15. A carriage 19 is supported on the guide shaft 17 so as to be slidable in the axial direction, and a first magnetic head 21 is attached to the carriage 19 on an extension line extending in the centripetal direction of the rotating body 9. In addition, the carriage 19
A support arm 23 is rotatably supported at the rear of the support arm 23, and the support arm 23 is urged downward by the elastic force of a wire spring (not shown). Then, at the tip of the support arm 23, a second
A magnetic head 25 is attached so as to face the first magnetic head 21. Further, a slide contact pin 23a having an axis in a direction orthogonal to the front-rear direction is integrally formed on the support arm 23, and the slide contact pin 23a is slidably supported on an upper surface of an upper plate 45a of a cassette holder 45 described later. ing. As a result, when the cassette holder 45, which will be described later, is moved to the upper position, the support arm 23 moves to the second magnetic head 25 as shown in FIG.
Is held so as to be positioned slightly below the upper surface of the upper plate 45a of the cassette holder 45, and the separation width of the second magnetic head 25 from the first magnetic head 21 is set to be minimum. The support arm 23 is rotated so that the second magnetic head 25 comes into contact with the upper recording surface of the magnetic disk 13 when the cassette holder 45 is moved to the lower position. A step motor 27 is attached to the support frame 15, and the carriage 19 is meshed with a feed screw 29 attached to a rotation shaft (not shown) of the step motor 27.
Then, the carriage 19 is moved in the front-rear direction by the feed screw 29 that rotates in accordance with the driving of the step motor 27.

A slide member 31 is engaged with the frame 3 by four guide holes 33 formed on both front and rear sides of a bottom surface and four support pins 35 provided upright on the frame 3 corresponding to the guide holes 33. It is movably supported in the front-back direction. The slide member 31 has one end hooked on the support pin 35 and the other end hooked on the support pin 35. The elastic force of the tension spring 37 urges the slide member 31 forward. . A lock lever 39 is rotatably supported on the rear side of the frame 3 about a shaft 39a, and the lock lever 39 has one end thereof supported by an elastic force of a tension spring 41 hooked on the support pin 35. It is urged to rotate counterclockwise about. When the slide member 31 is moved rearward against the elastic force of the tension spring 37, the lock portion formed at the tip of the lock lever 39.
39b is locked to the locked portion 31a formed on the slide member 31. In addition, a pin 39c is formed integrally with the other end of the locking lever 39 so as to abut the insertion end of the cassette 11 inserted into the cassette holder 45. Is rotated clockwise against the elastic force of the tension spring 41. A cam portion 43, which is inclined downward from the front to the rear, is formed on the facing side plates 31b of the slide member 31 so as to correspond to the guide groove 7.

Between the side plates 31b of the slide member 31, a cassette holder 45 having a cross section in a direction orthogonal to the insertion direction of the cassette 11 is arranged, and engaging pins as engaging portions provided on both sides of the cassette holder 45. 47 is the guide groove 7 and the cam portion
Each of them is slidably engaged with 43. The cassette holder 45 is moved by the cam portion 43 according to the forward and backward movement of the slide member 31.
The engaging pin 47 slidingly contacting the slider moves up and down along the guide groove 7 so that the cassette 11 can be inserted into and ejected from the cassette holder 45, and the magnetic disk 13 of the inserted cassette 11 moves to the rotating body 9. Moved to and from the chucked lower position. Upper plate 45a of the cassette holder 45
Four pressing projections 49 are integrally formed on the lower surface so as to project downward at a required height corresponding to each support pin 35. When the cassette holder 45 is moved to the lower position, the pressing projection 49 comes into contact with the upper surface of the inserted cassette 11 and has recesses (not shown) formed on the lower surface thereof for supporting pins.
By engaging with 35, it acts to maintain the inserted state of the cassette 11 in the cassette holder 45. Further, as shown in FIG. 2, guide protrusions 51 as guide members on the upper plate 45a are moved to the centripetal side of the magnetic disks 13 provided on the front and rear sides, respectively.
It is integrally formed by recessing inwardly at a height substantially corresponding to the pressing projection 49 at a substantially intermediate portion of each pressing projection 49 corresponding to the vicinity of the magnetic head 25. A shutter opening / closing lever 53 is rotatably supported behind the cassette holder 45 about a shaft 53a. One end of the shutter opening / closing lever 53 is driven by an elastic force of a tension spring 55 hooked on the cassette holder 45. It is urged to rotate counterclockwise about the shaft 53a. When the cassette 11 is inserted into the cassette holder 45, the shutter opening / closing lever 53 is rotated counterclockwise while contacting one end of the shutter 12 that covers the head access window (not shown) of the cassette 11. The opening 12a is aligned with the head access window. As a result, the head access window is opened.

Next, the operation of the magnetic recording / reproducing apparatus 1 configured as described above will be described with reference to FIGS.

First, the state before insertion of the cassette 11 will be described with reference to FIG. 2. The slide member 31 is moved rearward against the elastic force of the tension spring 37. At this time, the locked portion 31a of the slide member 31 is locked with the lock portion 39b of the lock lever 39 that is urged counterclockwise by the elastic force of the tension spring 41, and the slide member 31 moves rearward. The state is retained. Further, in the above state, the cassette holder 45 is moved to the upper position by the sliding contact of the engagement pin 47 with the guide groove 7 and the cam portion 43. Further, the support arm 23 abuts the sliding contact pin 23a on the upper surface of the upper plate 45a of the cassette holder 45 which has moved to the upper position, so that the second magnetic head 25 resists the elastic force of the wire spring.
However, it is rotatably held at a height that substantially coincides with the lower surface of the upper plate 45a into which the cassette 11 can be inserted so that the width of separation from the first magnetic head 21 is minimized.

Next, referring to FIG. 3 showing the state where the cassette 11 is inserted into the cassette holder 45, the cassette is inserted into the cassette holder 45.
When the cassette 11 is inserted, the cassette 11 is inserted rearward from the lower surface of the upper plate 45a of the cassette holder 45 by the front pressing protrusion 49 that abuts on the upper surface of the cassette 11 in a separated state according to the height of the pressing protrusion 49. Be guided. The insertion end of the cassette 11 corresponds to the vicinity of the second magnetic head 25, and the guide protrusion 51 between the pressing protrusions 49.
When the cassette 11 is inserted up to this point, the cassette 11 is guided by the guide protrusion 51 that abuts on the upper surface of the upper plate 45a so as to be spaced downward from the lower surface of the upper plate 45a. At this time, as shown by the alternate long and short dash line in FIG. 3, the cassette 11 is placed in the cassette holder 45 in a posture in which the insertion end contacts the lower surface of the upper plate 45a after passing through the front pressing protrusion 49. Even when it is inserted, the insertion end of the cassette 11 is separated from the lower surface of the upper plate 45a by the guide projection 51 provided near the second magnetic head 25 as shown by the solid line in FIG. Since the insertion posture is corrected to a substantially horizontal state, contact of the insertion end of the cassette 11 with the second magnetic head 25, which is held on standby so that the separation width from the first magnetic head 21 is minimized, is avoided. Then, when the cassette 11 whose insertion posture is corrected and held by the pressing protrusion 49 and the guide protrusion 51 in a substantially horizontal state is inserted to the rear pressing protrusion 49, the shutter 12 of the cassette 11 is inserted.
With the rotation of the shutter opening / closing lever 53 with which it abuts, the head access window and the opening 12a are moved substantially in the direction orthogonal to the insertion direction. As a result, the head access window is opened. Also, the lock lever 39 is pulled by the tension spring 41 by the contact of the pin 39c with the insertion end of the cassette 11.
When it is rotated clockwise against the elastic force of the
When the locking of the locking portion 39b with respect to a is released, the slide member 31 is moved forward by the elastic force of the tension spring 37. Thereby, the engagement pin for the guide groove 7 and the cam portion 43
With the sliding contact of 47, the cassette holder 45 is moved to the lower position. Then, the cassette holder 45 moved to the lower position
The cassette 11 inserted into the cassette holder 45 is inserted into the cassette holder 45 such that the upper end of the support pin 35 is engaged with the recess provided on the bottom surface of the cassette 11 by the pressing projections 49 that come into contact with the front and rear sides of the upper surface. Is retained. Further, with the movement of the cassette holder 45 to the lower position, the support arm 23 is rotated downward by the elastic force of the wire spring due to the sliding contact of the sliding contact pin 23a with the upper surface of the upper plate 45a, and the head opened by the opening 12a. The second magnetic head 25 is brought into contact with the upper recording surface of the magnetic disk 13 through the access window. At this time, the first magnetic head 21 is brought into contact with the lower recording surface of the magnetic disk 13, and the engagement pin 9a of the rotating body 9 is engaged with the hub portion of the magnetic disk 13. In the state described above, the magnetic disk 13 is driven by the step motor 27 on each recording surface of the magnetic disk 13 which is rotated in a desired direction by driving the electric motor.
Required data is recorded / reproduced by the first magnetic head 21 and the second magnetic head 25 moving in the radial direction.

When the slide member 31 is moved rearward against the elastic force of the tension spring 37 after the recording / reproducing operation of various data for the magnetic disk 13, the cassette holder 45 is engaged with the guide groove 7 and the cam portion 43. It is moved to the upper position by the sliding contact of the pin 47. At this time, the locked part moved to the rear
The sliding state of the slide member 31 with respect to the rear is maintained by locking the locking portion 39b with respect to 31a. Further, the movement of the cassette holder 45 with respect to the upper position releases the engagement of the support pin 35 with the concave portion of the lower surface of the cassette 11. Further, the lower recording surface of the magnetic disk 13 is separated from the first magnetic head 21 by the upward movement of the cassette holder 45, and the support arm 23 rotates upward due to the sliding contact of the sliding contact pin 23a with the upper surface of the upper plate 45a. Then, the second magnetic head 25 is separated from the upper recording surface of the magnetic disk 13. Then, in the above state, the cassette 11
The head access window is closed by the shutter 12 which moves in the opposite direction by the elastic force of the wire spring built in the shutter 12, and the closing operation of the shutter 12 and the tension spring 55.
The cassette 11 is ejected from the cassette holder 45 by the shutter opening / closing lever 53 which is rotated counterclockwise by the elastic force of the.

As described above, in this embodiment, the second magnetic head in which the insertion end of the cassette 11 inserted in the cassette holder 45 facing upward is moved from the first magnetic head 21 with the minimum separation width.
When reaching the vicinity of 25, the cassette 11 is corrected by contact with the guide member 51 so that the insertion posture thereof becomes substantially horizontal, and the contact of the insertion end with the second magnetic head 25 is prevented. . As a result, the cassette 11 can be reliably inserted into the cassette holder 45, and the separation width between the first magnetic head 21 and the second magnetic head 25 when the cassette is inserted can be minimized, and the magnetic recording / reproducing apparatus 1 can be made thin. It can be made compact and compact. Further, the guide protrusion 51 can be formed by denting a part of the upper plate of the cassette holder 45, which does not require as many parts as the conventional jacket guide member and simplifies the cassette guide mechanism. The device itself can be made thin and compact.

[Effects of the Invention] Therefore, even when the distance between the magnetic head and the magnetic disk according to the present invention is set to a minimum, contact between the magnetic head and the cassette can be prevented by utilizing a part of the cassette holder that holds the cassette. It is possible to provide a magnetic recording / reproducing apparatus capable of reliably and smoothly inserting a cassette and reducing the thickness and size of the apparatus.

[Brief description of drawings]

FIG. 1 is a perspective view of a magnetic recording / reproducing apparatus according to the present invention, and FIG.
FIG. 3 is a longitudinal sectional view of the assembled magnetic recording / reproducing apparatus, taken along the line AA in FIG. 1, and FIG. 3 is an explanatory view showing the operation. In the figure, 1 is a magnetic recording / reproducing apparatus, 3 is a frame, 7 is a guide groove as a guide, 11 is a cassette, 13 is a magnetic disk, and 25
Is a second magnetic head, 31 is a slide member, 43 is a cam portion, 47
Is an engaging pin as an engaging portion, and 51 is a guide protrusion as a guide member.

Claims (1)

[Scope of utility model registration request] 1. A cassette holder is provided which is movable between an upper position where a cassette in which a magnetic disk is rotatably accommodated can be inserted and ejected and a lower position where a magnetic head is brought into contact with the magnetic disk. In a magnetic recording / reproducing apparatus for recording / reproducing various data on / from the magnetic disk, when a cassette is inserted into the cassette holder, a guide member for restricting contact of an insertion end of the cassette with a magnetic head separated from the magnetic disk. The magnetic recording / reproducing apparatus is characterized in that a part of the upper plate of the cassette holder located in the vicinity of the magnetic head is a guide protrusion that is recessed toward the inside of the cassette holder.