JPS60242558A - Disk type recording and reproducing device - Google Patents

Abstract

PURPOSE:To allow one motor to rotate a disk and to move a head by providing a rotating body for linkage which is driven by a continuous rotating body to rotate, a rotated body which is driven by the rotating body, a cam part for head movement which varies in diameter stepwise, and engagement parts which are as many as steps. CONSTITUTION:A small-diameter gear 104 is driven in a direction H together with the rotating body and a gear 115 is driven in a direction I. Normally, a control lever 120 engages the lock recessed part 112 of a cam body 109, which is inhibited from rotating; and the other arm end part 122 of the control lever 120 is separated from a gear 118 for engagement, so an annular gear 116 is driven in a direction J. When a head carriage is shifted in position, the coil 312 of an electromagnet 125 is conducted to allow an iron core 126 to repulse a permanent magnet 124, then the control lever 120 rotates clockwise and while an arm end part 121 disengages from a lock recessed part 12, the arm end part 122 engages the gear 118 to rotate the cam body 109 and inhibit the rotation of the annular gear 116, so that the cam body 109 is driven in the direction L.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a disk-shaped recording/reproducing device that uses a disk-shaped recording medium such as a magnetic disk.

A magnetic disk device is an example of a disk-type recording/reproducing device. In magnetic disk drives, it is necessary to move the magnetic head in the radial direction of the disk. Therefore, it has been proposed to use a rotary stamping motor, convert the rotational force of this motor into linear motion using a steel belt, etc., and move the hend carriage body linearly in the radial direction of the disk. . In addition, a magnetic head is attached directly to a moving element of a linear pulse motor or a voice coil motor, and the head is moved in the radial direction of the disk.

However, the conventional apparatus described above requires a motor for moving the head in addition to a motor for rotationally driving the disk, resulting in a problem that it is expensive. Furthermore, since the motor itself for moving the head needs to move intermittently, there is also the problem that an expensive motor must be used.

An object of the present invention is to provide a disc that enables a head to be moved intermittently by a continuously rotating motor, and thus enables the rotation of the disc and the movement of the head to be performed by - number of morphs. An object of the present invention is to provide a type recording/reproducing device.

The invention will now be described with reference to illustrated embodiments.

First, the first example of a magnetic disk applicable to the device of the present invention will be described.
This will be explained with reference to FIGS. The magnetic disks shown in FIGS. 1 to 3 are in the form of a cassette. That is, a flat box-shaped hard case 2 and a flexible disk 3 rotatably housed within the hard case.
A magnetic disk cassette 1 is mainly composed of the following. A disk hub 4 is integrally provided at the center of the disk 3. The disc hub 4 is provided with conical protrusions 5 on the upper and lower surfaces of its center, and an annular protrusion 6 is formed around these protrusions 5, and furthermore, inside the protrusion 6 there are provided the following. An engaging protrusion 7 having a triangular cross section is provided for engaging with a protrusion of the spindle hub 105 to rotationally drive the disk hub 4 . The disk hub 4 having these protrusions 5, 6, etc. is exposed through a window hole formed in the case 2. An opening 8 is provided at one side edge of the case 2 on the upper and lower surfaces so that a magnetic head can enter and come into contact with the recording surface of the disk 3. At the edge of the case 2 where the opening 8 is formed, a step is formed that is slightly lower than the upper and lower surfaces of the case 2, and a step is formed in this step so as to sandwich the case 2 from above and below, and along the step. A shutter plate 9 is slidably attached. Window holes 10 are formed in the shutter plate 9 so that the magnetic head can enter and come into contact with the recording surface of the disk 3 so that the windows 10 are vertically overlapped. The shirt top plate 9 has a pair of folding pieces 12.
13 is formed, and a pair of guide pieces 14, 14 are formed by folding down. The guide piece 14.14 is a guide s18.14 formed along one side edge of the case 2.
18 to guide the sliding movement of the shack plate 9. A notch 15.16 is formed in the opening 8 of the case 2 continuously to the opening, so that when the shirt flap plate 9 moves to the left in FIG. It is designed so that it does not come into contact with the edge of the opening 8.

The case 2 also has a groove 17 in which the J-shaped bent portion 11a of the spring 11 is attached to the sliding portion of the shank plate 9, and a groove 17 in which the shank plate 9 is slid parallel to the guide groove 18.18. Notch 1 into which a pin (described later) should slide in order to
9.20 is formed. The above-mentioned bent portion 11 of the spring work 1
a is fitted into groove 17 and then installed in groove 1.
It is welded by heating the area around 7. The shirt cover plate 9 is attached to the case 2 while pushing open the upper and lower overlapping parts vertically.

In that case, the guide piece 14.14 of the shirt shirt plate 9 is inserted through the notch 27.27 formed so as to be connected to the guide a18.18 of the case 2. At this time, the left end of the shank plate 9 in FIG. 2 is in contact with the upper and lower surfaces of the case 2, which is higher than the step on which the shank plate 9 is attached. When the shirt shirt plate 9 is moved in the direction of the guide groove 18.18, the guide piece 14.14 of the shirt shirt plate 9 fits into the guide groove 18.18, and the left end 9a of the shirt shirt plate 9 in FIG. The shirt cover plate 9, which had fallen into the step part 2 and was pushed open, returns to its original state, and the guide piece 14
．． 14 and the guide grooves 18 and 18 are maintained, thereby preventing the shirt shirt plate 9 from falling off. Then, with the shirt cover 9 attached to the case 2 as described above, the spring 11 is
The L-shaped bent portion 11b at the other end is hung on the fold-down piece 12 of the shirt flap plate 9, and the shirt flap plate 9 is closed by the elasticity of the spring 11 to the window hole 10 of the shirt flap plate 9 and the opening 8 of the case 2. They are biased so as to slide in a direction that blocks the opening 8. When the shirt flap plate 9 is slid against the biasing force of the spring 11, the spring 11 engages with the fold-down piece 13 of the shirt flap plate 9, and the bent portion 11b of the spring 11 comes off from the fold-down piece 12. It is designed to prevent The shirt shirt plate 9 is formed with a cutout engagement portion 30 that is to be engaged with a pin 89 of an opening/closing member 81, which will be described later.

At the corners of the hard case 2, rectangular recesses 21.22 are provided, and within these recesses are circular holes 23.23 into which pins for positioning the cassette 1 are to be inserted. The case 2 also has a recess 2 on the end surface on the side where the shutter plate 9 is attached for detecting incorrect insertion of the cassette 1.
4.25 is provided.

The case 2 is provided with write-preventing holes 26 and 26 at the edge of the shirt cover 9 opposite to the mounting portion thereof.

A recess 28.28 is provided on the side surface of the case 2 where these holes 26.26 are formed, and a recess 28.28 is provided in the fourth part 28.28.
6.26 Write-protection operation piece 29.2 for opening and closing
9 is built-in.

Next, a cassette loading device for loading the magnetic disk cassette 1 configured as described above will be explained. 4 to 7, the cassette loading device mainly includes a chassis 42, a cassette holder 4o and an upper case 41 rotatably supported by the chassis 42, and a cassette holder 40.
It consists of a pressing member 66 provided above. chassis 42
, a support portion 44 having a pin 43 that serves as a support shaft for the upper case 41, a support portion 46 that has a pin 45 that serves as a support shaft for the holder 44, and a pin 47.4 that positions the cassette 1.
8, and a spindle hub 105 protrudes from the upper surface of the chassis 42. As shown in FIG. 5, the upper case 41 has a top plate 52 and side plates 5o and 51 formed by bending both side edges of the top plate.

At the base end of the side plate 50.51, there is an engaging portion 5 for engaging the pin 43.
3 is formed, and the engaging portion is rotatably supported by a pin 43. The upper case 41 is urged to rotate counterclockwise in FIG. 4, that is, in a direction away from the chassis 42, by a spring 55 applied between the case and the locking portion 54 of the chassis 42. As shown, the engaging portion 56 formed on the side plate 50 engages with the protrusion 57 of the chassis 42.
By coming into contact with this, the limit of rotation due to the biasing force is defined, and the rotation mode is maintained. As shown in FIG. 5, the upper surface plate 52 of the upper case 41 has a bent portion 58 for vertically moving the upper pad at a position near the base end, and a bent portion 58 for pressing the disk hub. A pressing portion 59 and lifting portions 6o, 6o for lifting the holder 40 at a position near the free end are formed, and a notch step portion 61 is formed in the side plate 51.

As shown in FIG. 6, the holder 4o includes left and right top plates 65.65, and side plates 62.6 following these top plates.
3 and a bottom plate 93 that connects these side plates together to be able to receive the cassette 1. Side plate 6
At the base end of 2.63 is the pin 45.4 as a supporting shaft.
A pin hole 64.64 into which a 5 is inserted is formed. Top plate 6
5 is formed with an appropriate number of protrusions 67, and these protrusions 67
The hole 68 of the holding member 66 is fitted and caulked,
Thus, the pressing member 66 is fixed to the top plate 65. The holding member 66 has a pair of bent portions 69.69 extending from the front end toward the rear end, and these bent portions 69.6.
A hub presser piece 71 is formed between the hubs 9 and 9 and has a recess 70 whose free end protrudes downward. The base of the hub holding piece 71 is connected to the bent portions 69.6 on both sides by the connecting piece 72.
9, and when the bent portions 69 and 69 bend, the hub presser 71 also bends. Arm-shaped side pieces 73 and 77 are integrally formed on the left and right sides of the holding member 66, and the tip end 74 of the left side piece 73 in FIG. A bent piece 75 is formed. The bent piece 75 is located in a notch 76 formed in the side plate 62 of the holder 40. Also, the right side piece 7
The tip end 78 of 7 is also bent slightly downward. However, the side piece 77 is slightly shorter than the other side piece 73, and a protruding piece 79 is formed on the side piece 77 toward the outside.

Spring locking pieces 80.80 are formed at the bases of the side pieces 73.77, pointing towards each other inward. The holding member 66 is also integrally formed with a holding portion 82.82 for holding an opening/closing member 81.81 for opening and closing the shirt shirt plate 9 on the inner side of the side pieces 73.77. Holding part 82.82
84.84 for covering the base 83.83 of the opening/closing member 81.81; a cam portion 85.85 for serving as a guide when rotating the opening/closing member 81.81; It has stepped regulating portions 86, 86 for regulating the rotational position of 81. The opening/closing member 81.81 includes a pin 87.87 serving as a rotation axis, and a projecting piece 88.88 located below the holding portion 82 and serving as a guide for rotation of the opening/closing member 81.
and pins 89 and 89 for engaging the recess 30 of the shirt flap plate 9 and sliding the shirt flap plate 9.

The opening/closing member 81.81 has its pin 87.87 connected to the holder 4.
The locking piece 80 of the holding member 66 is inserted into the hole 91 of
, 80, the left opening/closing member 81 is biased clockwise in FIG. 6 and the right opening/closing member 8I is biased counterclockwise. The side surface of .81 is the regulating portion 86 of the pressing member 66.
By coming into contact with 86, the rotation due to the biasing force is restricted. Base 8 of opening/closing member 81.81
3.83, a pressing portion 84 of the pressing member 66 fixed to the holder 4o by a protrusion 67 is located to prevent the opening/closing member 81.81 from being removed.

The opening/closing member 81.81 is connected to the holding portion 82.81 of the holding member 66.
Although the opening/closing member 81.81 is rotated by sliding on the upper surface of the opening/closing member 81.81, the protrusion 88.8 is located below the holding portion 82.82. A cassette insertion opening 92 is formed at the free end of the holder 40,
The spindle hub 1 is located in the center of the bottom plate 93 of the holder 40.
05 and a notch 94 into which the head carriage fits. A protrusion 95 for preventing erroneous insertion of a cassette is provided at the back left side of the holder 40 in FIG.

A bent portion 96 is provided at the rear end of the holder 40 , with which the rear end surface of the cassette 1 comes into contact to regulate the position of the cassette 1 .

Next, the operation of the cassette loading device will be explained with reference to FIGS. 4 and 7 to 9. In FIG. 7, when the disk cassette 1 is inserted through the insertion opening 92 with the shirt flap plate 9 side facing toward the back, the bin 89 of the opening/closing member 81 on the left side in the figure is inserted into the notch engaging portion 30 of the shirt flap plate 9. Since the bottle 89 is pushed by the wall of the notch 19 (see FIG. 1) provided in the case 2, the left opening/closing member 81 rotates counterclockwise. Due to this rotation of the opening/closing member 81, the bottle 89 moves to the left while drawing an arc, and accordingly, the shirt cover plate 9 is also moved to the left.
The window hole 10 of the shirt cover plate 9 and the opening 8 of the case 2 match. That is, the shank is opened. At this time, the opening/closing member 81 on the right side also has its bottle 89 in the notch 2 of the case 2.
0 (See Figure 1) It is pushed by the wall surface and rotated clockwise, but since the shirt flap plate 9 is not provided with a notch engaging portion to engage with the bottle 89 on the right side, the shirt flap plate 9 is rotated clockwise. There is no effect on the above movement of 9. When the shutter plate 9 is moved in this way and the shutter is opened, and the cassette 1 is pushed in, the recess 24 of the case 2 enters the protrusion 95 of the holder 40, and the end surface of the case 2 fits into the bent part 96 of the holder 40. This will reach the insertion limit for the cassette 1.

Also, by inserting the cassette 1, the side piece 7 of the holding member 66
The distal end 74 of the case 2 is once pushed upward by the case 2, but when the cassette throat 1 is inserted to the limit position, the distal end 74 plunges into the recess 2I of the case 2 and restrains the cassette 1 in the inserted state.

The cassette 1 is loaded in this manner, and information signals are recorded on and reproduced from the disc 3 by rotating the upper case 41 from the state shown in FIG. 4 to the state shown in FIG. . A pair of engagement pieces 97.97 are provided at the front end of the holding member 66, and the engagement pieces 97.9
7 is hooked onto the bent protrusion 6060 of the upper case 41, so that the upper case 41 is attached to the chassis 4 as shown in FIG.
2, when the holder 40 is rotated upward, the holder 40 also
It is rotating above 2.

However, when the upper case 41 is pushed down and rotated, the holder 40 also rotates downward. When the upper case 41 covers the lower case (not shown) and closes it, this state is maintained by the action of a locking mechanism (not shown).

FIG. 8 shows a state in which the upper case 41 has been pushed down and reached the recording/reproducing position, but the holder 40 and the upper case 4
1, the bending portions 69 and 69 of the holding member 66 are pushed by the pressing portion 59 of the upper case 41 and bent downward, and the holder 40 is biased downward. Bending portion 69.
Since the hub presser piece 71 is connected to the base of the hub 69 by the connecting piece 72, when the bent portion 69.69 bends downward, the hub presser piece 71 also bends downward, resulting in a record as shown in FIG. At the playback position, the protrusion 5 of the disc hub 4 is pushed by the downwardly protruding recess 70 at the tip of the hub holding piece 71;
The disk hub 4 is securely attached to the spindle hub 105. When the holder 40 is pushed down by the upper case 41, the bent portion 75 of the holding member 6G comes into contact with the chassis 42 before the holder 40 reaches the rotation limit position, and the holder 40
When pressed down further, the tip 74 of the side piece 73 of the holding member 66 is lifted. As a result, the tip 7
4 escapes from the recess 21 of the case 2, the restraint of the cassette 1 to the holder 40 is released, and the cassette 1 is positioned at the normal position by the positioning pins 47, 48 on the chassis. Note that the bottle 47 contacts the bottom of the recess 21 of the case 2 of the cassette 1, the tip of the bottle 47 enters the circular hole 23 of the case 2, and the bottle 48 contacts the bottom of the case 2 so that the front and rear of the cassette 1 and regulating the vertical position. Since the length of one side piece 77 of the holding member 66 is slightly shorter than the length of the other side piece 73, when the position of the cassette 1 is regulated as described above, the position of the cassette 1 is regulated as shown in FIG. However, the tip end 78 of the side piece 77 has not yet come into engagement with the end surface of the recess 21 of the case 2. Further, by pushing down the upper case 41, the bent portion 58 is lowered, and accordingly, the upper carriage holding the upper magnetic head is lowered to take the recording/reproducing position. In FIG. 9, reference numeral 100 denotes a DC rotary motor, which is attached to the chassis to rotate the disk 3 and move the magnetic head. 101 is a pulley of the motor.

To eject the loaded cassette 1, the lock mechanism (not shown) is released and the upper case 41 and cassette holder 40 are rotated by the elasticity of the spring 55 as shown in FIG. Upper case 41
is rotated counterclockwise by the elasticity of the spring 55, the engagement piece 97 of the pressing member 66 fixed to the holder 40 is lifted by the bent protrusion 60 of the upper case 41, and the tip of the bottle 47 is thereby lifted. The cassette 1 is pulled out from the positioning hole of the cassette 1, and the spring 90.9 of the opening/closing member 81.81
It tries to be pushed outward based on the elasticity of 0. However, the tip 78 of the side piece 77 of the holding member 66 hits the wall surface at the back of the recess 21 of the cassette 1 and temporarily restrains the cassette 1. When the upper case 41 further rotates, the cutout step 61 provided in the upper case 41 pushes up the protruding piece 79 of the pressing member 66, disengaging the tip 78 from the recess 21 of the cassette 1, and springs the cassette 1. It is pushed outward by the rotation biasing force of the opening/closing member 81 based on the elasticity of the opening/closing member 90. The opening/closing member 8
1, the shutter plate 9 also returns to its original position and closes the shutter.

Next, the rotational drive mechanism of the disk 3 and the magnetic throat movement mechanism will be explained. In FIG. 10, a bearing 108 is fitted and fixed on the lower surface side of the chassis 42, and the shaft portion of the spindle hub 105 is rotatably supported by the inner periphery of the bearing 108. A boss of a small-diameter gear 104 is fitted and fixed to the shaft portion of the spindle hub 105 protruding from the lower end of the bearing 108, and a rotating body 103 is fitted and fixed to the boss of this gear 104.

The outer periphery of the rotating body 103 is a pulley portion, and the heald 102 is hung on this pulley portion. The bell 02 is also applied to the motor 100, so that as long as the motor 100 is being driven to rotate, the rotating body 103, gear 104, and spindle hub 105 are driven to rotate together. At the center of the spindle hub 105, there is a lower protrusion 5 provided at the center of the disk hub 4.
A hole 106 is formed in the spindle hub 105 to receive the disk, and a projection 107 is formed in the spindle hub 105 to engage with the engagement projection 7 of the disk hub 4 to rotate the disk 3 . The rotating body 103 and the small diameter gear 104 constitute a continuous rotating body.

A cam unit 109 for moving the hend carriage body is rotatably fitted on the outer periphery of the bearing 108.

As shown in FIGS. 11 and 21, the cam body 1
A cam groove 110 is formed on the upper surface side of the knife 09 for moving the knife. The cam groove 110 is
The cam body 109 is divided into two halves each having a half circumference, and the distance from the center of each half changes stepwise to form 17 levels. The distal portion of the cam groove 110 formed on the half circumference is connected to each other by a connecting groove 11. 12th
The figure expands the cam groove 110 and the connecting groove 111 to show how the distance from the center changes. On the other hand, on the outer periphery of the lower surface of the cam body 109, locking recesses 112 are formed as retaining portions corresponding to each stage position of the cam groove 110 and having the same number of stages as the number of stages. An annular projection 114 is formed at an intermediate portion between the outer periphery and the annular projection 114, and a downward protruding pin 113 is formed in a part of the annular projection 114. As shown in FIGS. 10 and 14 (B-B plan view in FIG. 10), the pin 113 has a gear 11 as a connecting rotating body.
5 is rotatably fitted, and an annular gear 116 as a driven rotating body is rotatably fitted to the outer peripheral portion of the annular protrusion 114. The gear 115 meshes with both the inward gear 119 formed on the inner periphery of the annular gear 116 and the small diameter gear 104 . As shown in FIG. 13, a ratchet tooth-shaped engagement gear 1 is provided on the outer periphery of the annular gear 116.
18 are formed corresponding to each stage of the groove 110. As shown in FIG. 15, FIG. 20, and FIG.
An engagement groove 134 is formed correspondingly. Cam body 10
9 is the direction of the arrow, the rear end portion of the engagement groove 134 becomes an inclined surface 134a with respect to this rotation direction and is connected to the lower surface 133 of the engagement groove 134 forming portion.

The cam groove 110 of the cam body 109 can also have a protruding cam edge.

14 and 15, a bell crank-shaped control lever 120 is provided on the side of the cam body 109 so as to be rotatable about a shaft 123. As shown in FIGS. A permanent magnet 124 is fixed to the edge of one arm of the lever 120, and when this magnet 124 and the iron core 126 of the electromagnet 125 attract each other, the first
In FIG. 4, the lever 120 is rotated counterclockwise, and normally the hook-shaped end 121 of one arm of the lever 120 enters and engages with the locking recess 112 of the cam body 109. On the other hand, the other hook-shaped arm end 122 of the lever 120 is connected to the annular gear 1.
Although it faces the engagement gear 118 on the outer periphery of No. 16, it is normally spaced apart from the engagement gear 118. Lever 12
0 has elasticity in the vertical direction, and when the arm end 121 is engaged with the locking recess 112 of the cam body 109, the arm is forcibly bent. It is brought into contact with the lower surface 133 of the engaging groove 134 formed in the shape of an eave.

FIG. 15 shows the configuration of the electromagnet 125. The electromagnet 125 consists of a case body 127, a coil 132, and an iron core 126. The coil 132 is installed in the center of the case body 127 in the space between the protrusion 128 and the cylindrical part surrounding it.
is fitted, and the coil is installed in the center hole 1 of the protrusion 128.
30 and a horseshoe-shaped iron core 126 in the hole 131 provided on the side.
are fitted and fixed. Hook-shaped mounting portions 129 are formed on both sides of the case body 127;
An electromagnet 125 is attached to the chassis by 9, and an iron core 126 faces the permanent magnet 124.

Next, the operation of the cam body 109 will be explained with reference to FIG. A small diameter gear 104 together with a rotating body 103 (see Fig. 10)
is rotationally driven in the direction of arrow H, and gear 115 is rotationally driven in the direction of arrow ■. Here, since the one arm end 121 of the control lever 120 normally enters and engages with the locking recess 112 of the cam body 109, rotation of the cam body 109 is prevented.
Further, the other arm end 122 of the control lever 120 is separated from the engagement gear 118 of the annular gear 116 and the annular gear 11
6 is free, so the rotation of the gear 115 rotates the annular gear 116 in the direction of arrow J via the inward gear 119. That is, normally only the annular gear 1.16 rotates continuously, the cam body 109 does not rotate, and the position of the head carriage does not change.

To change the position of the head carriage, use the electromagnet 125.
When the coil 132 is energized, the iron core 126 becomes the permanent magnet 124.
is excited so as to repel it. This allows the control lever 12
0 rotates clockwise in FIG. 14 and its arm end 1
21 is removed from the locking recess 112 of the cam body 109, the other arm end 122 of the lever 120 engages with the engagement gear 118 of the annular gear 116, and the cam body 109 becomes rotatable, whereas the annular gear 116 is prevented from rotating. Therefore,
The cam body 10 is rotated in the direction of the arrow 1 by the gear 115.
The downward protruding pin 113 of 9 is moved in the direction of the arrow, and the cam body 109 is rotationally driven in the direction of the arrow.

When the cam body 109 rotates, the position of a guide pin 159 (to be described later) fitted in the cam groove 110 moves in the radial direction of the cam body 109, and the head carriage also moves accordingly.

Here, assume that the coil 132 of the electromagnet 125 is momentarily energized. After the control lever 120 rotates clockwise in FIG. 14, it immediately attempts to return to its original position. However, the arm of the lever 120 where the hooked end 121 is formed bends downward in FIG. When the lever 120 rotates in this manner, the hooked arm end 121 is caught in the retaining groove 134 provided on the outer circumference of the cam body 109', and the lever 120 is prevented from returning. When the lever 120 is prevented from returning, the lever 120
The locking of the annular gear 116 by the other arm end 122 continues, and the cam body 109 attempts to rotate in the direction of the arrow.

As the cam body 109 rotates, the arm end 121 of the lever 120 is pushed down onto the inclined surface 134a of the engagement groove 134 as shown in FIG. 20, and when it reaches the same level as the lower surface 133, the engagement groove 134 and locking recess 1
12, and the rotation of the cam body 109 is again prevented. In this way, when the electromagnet 125 is momentarily excited, the cam body 109 is intermittently rotated by one tooth, and the head carriage is moved by one trunk.

The control lever 120, permanent magnet 124, electromagnet 125
The components comprising the above constitute a head movement control means.

In FIGS. 16 to 19, the head carriage that supports the magnetic nozzle mainly consists of an upper carriage nozzle 150 and a lower carriage 151. A gimbal plate 153 is attached to the head mounting portion 152 of the lower carriage 151.
The magnetic head 154 is supported so as to be swingable within a predetermined range. Partially cylindrical pin receiver parts 155 and 156 are formed on one side of the lower carriage nozzle 151, and when the carriage is attached to the chassis, the above-mentioned pin is inserted into the support pins 160 and 160, which are of the same type on the chassis. Uke is part 1
The carriage 151 is supported by the contacts 55 and 156 coming into contact with each other from above. Car 1 Runoji 1
The other side edge of 51 is also supported by pin 161.

A cut and raised portion 157 is formed on the carriage 151,
The entire carriage is urged downward and in the radial direction of the disk by the elasticity of a spring 162 applied between the cut and raised portion 157 and the chassis. Carriage 151
A pin (not shown), which is of the same type as the chassis, is lightly pressed against the flat portion 158 from above to prevent the entire carriage from floating up. Carriage 1
A guide pin 159 is provided at the tip of 51.
This pin 159 engages with the cam groove 110 to move the head carriage 151. A cut-and-raised portion 163 for attaching the upper carriage 150 is formed on the carriage 151, and a punched hole 164 is formed in this cut-and-raised portion 163. A screw 169 passing through a hole 166 of a leaf spring 165 and a hole 168 of a push-down spring 167 for pushing down the carriage 150 is screwed into this screw hole 164, so that the push-down spring 167
and the leaf spring 165 is connected to the cut-and-raised portion 16 of the carriage 151.
It is fixed to 3. In addition, the bent piece 17 of the leaf spring 165
0 is in contact with the end surface 171 of the cut and raised portion 163, and the bent piece 172 of the push-down spring 167 is in contact with the bent piece 1.
In addition, a pair of locking pieces 173 formed by bending the push-down spring 167 press the engagement portions 175 of the slots 174 of the leaf spring 165, so that the leaf spring 16
5 is securely attached to the cut and raised portion 163.

At the base 176 of the upper carriage 150 are two pins 177.
are of the same type, and the carriage 150 is attached to the leaf spring 165 by inserting this pin 177 into the hole 178 of the leaf spring 165 and caulking it. carriage 150
A bending piece 179 is provided in the middle of the upper case 41, and this bending piece 179 engages with the bending part 58 of the upper case 41, so that when the upper case 41 is raised, the bending piece 179 is bent. The bent portion 179 is lifted by the bent portion 58, and the carriage 150 is brought to the raised position.

The free end of the carriage 150 has a band attachment section 180.
is formed.

As shown in FIG. 18, the pad mounting portion 180 has shallow recesses 181 formed on the lower surface side, and these four portions 18
A gimbal plate 182 is fixed to 1. A window hole is formed in the band attachment portion 180, and a center plate portion 183 is formed so as to straddle the center of this window hole. A recess 184 is formed in the center of the center plate 183, and a lower end 185 of the recess 184 presses the center of the pad 186 via the gimbal plate 182. pad 1
The magnetic head 86 is made of the same material as the magnetic head 154, for example. The pad 186 can perform a gimbal operation using the lower end of the recess 184 as a fulcrum. In the case of double-sided recording, a magnetic head is attached in place of the pad 186. The tip end 187 of the push-down spring 167 presses down the recess 184 of the pad mounting section 180 from above, and urges the carriage 150 toward the carriage 151 side.

As shown in Fig. 7, cassette 1 is placed on the boulder 4o.
is not inserted to a predetermined position, the pin 89.89, which is one end of the opening/closing member 81.81, is attached to both sides of the carriage 150 due to the rotation biasing force of the opening/closing member 81.81 by the springs 9o, 9o. The opening/closing member 8 is positioned so that it can come into contact with the lower edge, and as shown in FIG. , 8 are rotated against the biasing force, so that one end thereof is spaced m from a position where it can come into contact with the carriage 150. Therefore, even if the holder 40 is moved to the recording/playback position without the cassette 1 inserted into the holder 40,
Since the carriage 150 is blocked by one end of the opening/closing member 81.81, the pad 186 (or the magnetic head) cannot come into contact with the disk 3, and the holder 40 cannot be opened with the cassette 1 inserted into the holder 40 to a predetermined position. The pad 186 (or magnetic head) can come into contact with the disk 3 only after it is moved to the recording/reproducing position.

With this configuration, the magnetic head and band (or magnetic head) will not come into contact even if the disc is moved to the recording/reproducing position without being inserted into the holder, and furthermore, The magnetic heads do not stick to each other, and there is no possibility of damaging the head support mechanism or the like by trying to forcibly separate the magnetic heads that are attracted to each other.

In FIGS. 14 and 16, a head position detection lever 135 is rotatably supported on the side of the cam body 1090 about a shaft 143. As shown in FIGS. A pin 139 is attached to the free end of the detection lever 135, and a switch contact piece 140 is in pressure contact with the pin 139, and the spring force of the switch contact piece 140 causes the lever 135 to move its hook-shaped free end 137. is biased to rotate in the direction of abutting against the locking recess 112 of the cam body 109. The free end 137 of the lever 135 is the same when the guide pin 159 of the head carriage is at the outermost position of the cam groove 110 and the magnetic head 154 is in sliding contact with the first trunk at the outermost position of the disk 3. It is adapted to engage with a locking recess 112a corresponding to the first trunk. This locking recess 112a is formed continuously with a recess 136 for detecting return to original position. The above locking recess 1
12a is formed to the same depth as the other locking recesses 112, but the original position return detection recess 136 is formed at the same depth as the other locking recesses 112.
It is formed even deeper than the The above detection lever 13
When the free end 137 of the lever 135 is engaged with the locking recess H2, 112a, the switch contact piece 140 is separated from the switch contact pieces 141, 142 on both sides, and the free end 137 of the lever 135 is detected. When the lever 135 is depressed into the recess 136, the contact piece 140 contacts the contact piece 142, detecting that the cam body 109 is in its original position, and the free end 1 of the lever 135
37 rides on the protrusion 138 between the locking recesses 112, the contact piece 140 comes into contact with the contact piece 141.

FIG. 16 shows a state in which the guide pin 159 is at the outermost position of the cam groove 110 and the head position detection lever 135 is at the locking recess 112a corresponding to the first trunk next to the home position return detection recess 136. It shows.

From this state, the cam body 109 is intermittently driven as described above, and is rotated by one tooth of the protrusion 138 between the locking recesses 112. Each time the cam body 109 rotates, the guide pin 159 shifts one step to the mesial cam edge of the cam edge of the cam groove 110, so that the sliding contact position of the magnetic hend 154 with respect to the trunk of the disk 3 is shifted to the inner periphery. You will be shifted one step at a time to the side track. Further, each time the cam body 109 rotates by one tooth of the protrusion 138, the switch contact pieces 140 and 141 come into contact and one signal is emitted, and by counting this signal, the magnetic head 154 is It is possible to detect the number of adjacent tracks. In addition, the detection lever 135
When the free end 137 of the switch is engaged with the home position detection recess 136, the switch contacts 140 and 142 come into contact, and the signal generated thereby indicates that the cam body 109 is at the reference position. It can be detected that the guide bin 159 completely engages the two cam grooves 110 with the connecting groove 111.

In this way, since the sliding contact position of the magnetic head 154 is always detected, the signal due to the contact between the contact piece 140 and the contact piece 141 is counted, and the signal due to the contact between the contact piece 140 and the contact piece 142 is counted. By detecting this, the magnetic head 154 can be brought into sliding contact with a desired track.

In the illustrated example, the magnetic disk cassette 1 is a single-sided type cassette, and recesses 24 and 25 are provided at both the top and bottom of the cassette 1 to prevent incorrect insertion, and the magnetic head 154 provided at the bottom is On the other hand, the cassette can be used by being turned upside down, and even when the cassette is turned upside down, incorrect insertion can be prevented. However, if the recess 25 on one side of the cassette 1 is removed so that the cassette 1 can only be inserted with one side facing, and if the band 186 is replaced with a magnetic head, the cassette 1 and the disk drive can be easily inserted. Can be used as a double-sided type. Further, the number of steps in the cam groove 110 of the cam body 109 can be increased or decreased as appropriate, and the magnetic head can be moved from the trunk position at the outermost circumference of the disk to the trunk position at the innermost circumference by one rotation of the cam body. You can also. Furthermore, since the gist of the present invention is a mechanism for moving the head in the radial direction of the disk using the rotational motion of a continuous rotary body, the type of cassette and the configuration of the cassette loading mechanism are limited to those shown in the drawings. It is not a set of rules and can be changed arbitrarily. Further, the design of the magnetic head moving mechanism may be freely changed without departing from the technical matters set forth in the claims.

According to the present invention, the present invention includes a continuous rotating body, a connecting rotating body rotationally driven by the continuous rotating body, and a driven rotating body rotationally driven by the connecting rotating body, and the diameter changes in stages. A cam body having a cam portion for moving the head, and a head movement control means that can be engaged with the cam body, and the head movement control means regulates rotation of the cam body when the head is not moved. At the same time, the driven rotary body is rotated, and when the head moves, the restriction on the rotation of the cam body is released and the rotation of the driven rotary body is regulated, so that the continuous rotational force of the continuous rotary body is transferred to the head. This can be converted into intermittent linear movement, eliminating the need to use an expensive motor that performs μ-intermittent movement as a head movement motor, and the head can also be moved using the rotational force of the motor that rotates the disk. It has the effect of being able to do it.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing an example of a magnetic dispersion cap that can be used in the present invention, Fig. 2 is an exploded perspective view of the above-mentioned blade cent, and Fig. 3 is a partial side view of the above-mentioned cassette/1. , FIG. 4 is a side view showing the embodiment of the present invention, FIG. 5 is a plan view showing the upper cover in the above embodiment, and FIG. 6 is an exploded perspective view showing the cassette holder part in the above embodiment. Fig. 7 is a plan view of the above embodiment, Fig. 8 is a side view showing different operating modes of the above embodiment according to Fig. 4, and Fig. 9 is a side view showing different operating modes of the above embodiment according to Fig. 7. FIG. 10 is a longitudinal sectional view showing the magnetic head moving cam body and its surrounding parts in the above embodiment, FIG. 11 is a plan view of the same cam body, and FIG. 12 is a cam of the same cam body. A developed view of the edge, FIG. 13 is a plan view showing the annular gear in the above embodiment, FIG. 14 is a partially sectional plan view showing the rotation converting means in the above embodiment, and FIG. 15 is a plan view showing the rotation converting means in the above embodiment. FIG. 16 is an exploded perspective view of the control mechanism used in the conversion means, FIG. 16 is a plan view of the magnetic head moving mechanism in the above embodiment, and FIG. 17 is an exploded view of the magnetic head support mechanism in the above embodiment. Slope view, Figure 18 is line A in Figure 17
- A sectional view taken along line A, FIG. 19 is a plan view of the magnetic head support mechanism, FIG. 20 is an enlarged side view of a part of the cam body, and FIG. 21 is a longitudinal sectional view of the same cam body. It is.

Claims (1)

[Claims] A continuous rotating body, a connecting rotating body (115) rotationally driven by this continuous rotating body, a driven rotating body (116) rotationally driven by this connecting rotating body, and a head movement whose diameter changes stepwise. a cam body that rotatably holds the coupling rotary body and has a cam part for the purpose of operation and a number of engaging parts (112) equal to the number of stages, and a moving head capable of engaging with the retaining part of the cam body. The head movement control means regulates the rotation of the cam body and rotates the driven rotary body when the head is not moved, and releases the rotation restriction of the cam body when the head is moved. A disc-shaped recording/reproducing device configured to control the rotation of a driven rotary member.