JPH0814924B2 - Recording medium confirmation device for auto changer - Google Patents

Description

Description: BACKGROUND OF THE INVENTION The present invention relates to recording a signal on an arbitrary track by moving a recording / reproducing head in a radial direction of a rotating recording medium.
In a recording / reproducing apparatus for reproducing a signal from an arbitrary track, or for both recording and reproducing, a device for confirming whether or not a recording medium is inserted in a predetermined position in a holding mechanism thereof, particularly, The present invention relates to a recording medium confirmation device suitably provided in an auto changer capable of holding recording media, automatically moving them to recording / reproducing positions, and exchanging recording / reproducing recording media.

The applicant has already proposed an auto changer capable of automatically and quickly exchanging a plurality of recording media (Japanese Patent Application No. 62-110484). This auto changer includes a rotating body having a plurality of mechanisms for detachably holding a recording medium on the circumference at equal angular intervals. This rotator rotates at a high speed to quickly move a predetermined recording medium to a recording / reproducing position or a recording medium attaching / detaching position.

The control for rotating the rotating body to move the desired recording medium to the recording / reproducing position is executed by, for example, a microprocessor. For this control, which recording medium is held at which position on the rotating body. Need to know in advance. Data indicating the relationship between the identification code of the recording medium and the position where the recording medium is held is created based on an input signal from an input means such as a keyboard when the recording medium is attached to or detached from the rotating body. However, it is necessary to confirm by other means that the recording medium is inserted in each holding position. This is because the input of data and the attachment / detachment of the recording medium may not necessarily correspond due to some erroneous operation.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a device capable of confirming the presence or absence of a recording medium in association with the movement of a moving body such as the rotating body.

According to the recording medium checking device in the auto changer of the present invention, a plurality of holding mechanisms for detachably holding the recording medium are provided on the moving body along one edge thereof, and the insertion / removal opening of the holding mechanism is moved as described above. The moving body is provided so as to face toward the edge of the body, and the moving body is moved by a drive device so that all the holding mechanisms of the moving body sequentially pass through a recording medium attaching / detaching position and a recording / reproducing position. And a push-in for pushing the recording medium held by the holding mechanism to a position between the attachment / detachment position and the recording / reproducing position in the vicinity of the path through which the holding mechanism passes along with the movement of the moving body. A pushing device having a member is provided, and the pushing member is urged toward the edge of the moving body in a direction substantially orthogonal to the moving path of the holding mechanism, and the holding member is held at the edge of the moving body. Machine A dent is formed at a location where the recording medium is provided, and the recording medium can be inserted into the holding mechanism until one side thereof reaches an intermediate position between the moving path of the edge of the moving body and the dent, and the press-fitting is performed. The member follows the edge of the moving body and the one side of the recording medium held in the holding mechanism along with the movement of the moving body, and when the recording medium does not exist in the holding mechanism, the member of the moving body moves. A presence / absence detection device for a recording medium, which is operated by the pushing member toward the recess, is provided. The moving body includes not only a rotating body but also a linear moving body.

In the above description, the recording / reproducing position is a concept including a recording position for recording information on the recording medium, a reproducing position for reproducing the information recorded on the recording medium, and a position for both recording and reproducing.

A plurality of holding mechanisms for holding the recording medium sequentially pass through the attaching / detaching position of the recording medium and the recording / reproducing position as the moving body moves. A pushing device having a pushing member is provided in the vicinity of the path through which the holding mechanism passes and between the attaching / detaching position and the recording / reproducing position. The pushing member is biased toward the edge of the moving body in a direction substantially orthogonal to the moving path of the holding mechanism.

A recess is formed in the moving body at a position where the holding mechanism is provided. The recording medium can be inserted into the holding mechanism until one side thereof reaches an intermediate position between the movement path of the edge of the moving body and the recess. When there is a recording medium in the holding mechanism, the pushing member extends along the edge of the moving body and the one side of the recording medium held in the holding mechanism as the moving body moves. At this time, since the recording medium presence / absence detecting device does not operate, it is determined that the recording medium exists in the holding mechanism.

When there is no recording medium in the holding mechanism, the pushing member moves into the recess of the moving body to activate the recording medium presence / absence detection device, and a signal indicating that there is no recording medium in the holding mechanism is given. Is output.

When the recording medium is not fully inserted to a predetermined position in the holding mechanism, when the holding mechanism passes the position where the pushing device is provided along with the movement of the moving body, the recording medium is pushed in The member is pushed into the holding mechanism. As a result, the recording medium is securely mounted in the holding mechanism. The presence / absence detection device for the recording medium does not operate, and the presence of the recording medium is detected.

According to this invention, when the holding mechanism of the moving body passes through the position where the pushing device is provided, the recording medium that has not been inserted to the predetermined position of the holding mechanism is forcedly pushed into the holding mechanism. Therefore, the recording medium is securely attached to the holding mechanism. Since the pushing device is provided between the attachment / detachment position and the recording / reproducing position, the recording medium is securely attached to the holding mechanism before the recording medium reaches the recording / reproducing position.

Further, according to the present invention, when the holding mechanism on the moving body passes through the position where the pushing device is provided, it is possible to confirm whether or not the recording medium is loaded in the holding mechanism.

A recess is formed in the moving body at a position where the holding mechanism is provided, and when the recording medium is not present in the holding mechanism, the pushing member advances into the recess. The presence / absence detecting device is operated by the pushing member facing the recess, and it is detected that the recording medium is not present in the holding mechanism. When the recording medium is present in the holding mechanism, the pushing member extends along one side of the recording medium, so that the pushing member does not enter the recess any more and the presence / absence detecting device does not operate. It is determined that the recording medium exists in the holding mechanism.

The recording medium is a concept including a magnetic recording medium such as a floppy disk, an optical recording medium such as an optical disk, and a magneto-optical disk. The optical recording medium includes one that represents information by a combination of portions that transmit and block (or reflect) light.

Description of Embodiments An embodiment in which the present invention is applied to a magnetic recording medium confirmation device will be described below with reference to the drawings.

1 and 2 are schematic diagrams showing the entire mechanical structure of an auto changer in a magnetic recording / reproducing apparatus. FIG. 1 is a plan view thereof, and FIG. 2 is a line II-II of FIG. The cross sections are shown in each. Also in FIG.
The bucket 22 shown by arrow A is shown in phantom to show the video floppy F contained therein, and at the location shown by arrow B, the bucket has been removed to show the configuration of the disc 20 at that location. , Video Floppy F only is shown in dashed lines.

Referring to these drawings, in a video floppy F (magnetic recording medium) mounted on a magnetic recording / reproducing apparatus, a magnetic disk 18 is rotatably accommodated in a jacket 11 thereof. A disk hub (core) 19 at the center of the magnetic disk 18 is in the center hole 12 of the jacket 11. Magnetic disks on part of both sides of jacket 11
A window 14 is opened to expose the 18 recording / reproducing areas to the outside. This window 14 is normally closed by a shutter 15, but when it is inserted into a bucket 22 described later, the shutter 15 is automatically opened by an opening / closing mechanism (not shown) provided in the bucket 22. In addition, holes 13 are formed in several positions of the jacket 11 for receiving positioning pins 74, which will be described later, for positioning and fixing the video floppy F in the bucket 22.

The disc 20 for holding such a video floppy F is fixed to a belt wheel 31 fixed to a rotating shaft 30. The rotary shaft 30 is rotatably supported by a bearing stand 35 mounted and fixed on the bottom plate 1.

On the other hand, a step motor 40 for rotationally driving the disc 20 is arranged at a position slightly apart from the rotary shaft 30. The fixed position of the step motor 40 is preferably inside the outer peripheral edge of the disc 20 in order to use the space below the disc 20 as effectively as possible.

The horizontal member 41 is passed and fixed between the support member 42 fixed to the bottom plate 1 and the bearing stand 35. The step motor 40 is attached to the horizontal member 41 via a mounting member 43 with screws. The horizontal member 41 has a plurality of elongated holes 49 for passing the screws, and the output shaft 40 of the step motor 40.
A large elongated hole 48 is formed to allow a to protrude upward. Since the elongated hole 49 is formed, the mounting position of the step motor 40 can be adjusted.

A belt wheel 44 having teeth is fixed to an output shaft 40a of the step motor 40. Further, teeth are formed on the belt wheel 31 to which the disc 20 is fixed. A timing belt 45 is hung between these belt wheels 44 and 31, whereby the disc 20 is rotationally driven by the step motor 40. In this way, the rotational power of the step motor 40
Since the timing belt 45 is used as a means for transmitting to the 20, the timing belt 45 acts as a cushioning material, and noise and vibration can be suppressed.

On the disk 20, a plurality (10 in the embodiment) of buckets 22 for housing the video floppy F are fixed by screws. These buckets 22 are radially arranged on the same circumference at equal angular intervals (36 °). The outer end surface of the bucket 22 is opened at the whole surface for inserting or taking out the video floppy F and is cut out in an arc shape (this opening is referred to as an insertion / removal port, and the insertion / removal port and the notch are indicated by reference numeral 23). Moreover, the upper surface of the bucket 22 is greatly cut out and opened.
24 are formed. Video installed from opening 24
The window 14 and the central hole 12 of the floppy F are exposed.

An opening 25 is also formed in the disc 20 at a position corresponding to the opening 24 of the bucket 22. The opening 25 is the opening of the bucket 22.
It is opened longer than 24. When the bucket 22 reaches the recording / reproducing unit 50 described later and the recording / reproducing operation is started, the regulation plate 63 enters from above from the opening 24 and the window 14 and comes into contact with the upper surface of the magnetic disk 18. From below, the magnetic head enters through the opening 25 and the window 14 and contacts the lower surface (recording / reproducing surface) of the magnetic disk 18. Further, a spindle 75 of a motor 76, which will be described later, which drives the magnetic disk 18 to rotate, also advances into the opening 25 of the disk 20.

At the position where the bucket 22 is provided on the outer peripheral edge of the disk 20, a similar arcuate notch 21 is formed corresponding to the arcuate notch 23 of the bucket 22. These notches 21 and 23 are the attachment / detachment positions of the video floppy F (for example, the positions symmetrical with respect to the recording / reproducing unit 50 and the rotating shaft 30).
In order to facilitate the attachment / detachment of the video floppy F to / from the bucket 22. A part of the video floppy F mounted on the bucket 22 has these notches 21,23.
Since it is exposed to the outside from the outside, the video floppy F can be attached or detached by hand or by the attaching / detaching mechanism, and the operation of the pushing device 80 described later becomes easy.

The disc 20 is further provided with a hole 26 through which the positioning pin 74 passes and a positioning hole 27 through which the positioning pin 73 passes.
The positioning holes 27 are provided at equal angular intervals corresponding to the positions where the buckets 22 are provided.
For correctly positioning the recording / reproducing unit 50.

The lower peripheral edge of the belt wheel 31 extends outward in a brim shape (indicated by 32), and radial slits 33 are formed at equal angular intervals (θ = 36 °) at each angular position where the bucket 22 is provided. Has been formed. The place where the slit 33 is formed is called a set position SP. Two radial auxiliary slits 34 are formed on the collar 32 on both sides of one of the slits 33 and adjacent thereto. The position of the slit 33 sandwiched between the auxiliary slits 34 is called the home position (reference angle position) HP. The home position is also the set position. These slits 33, 34 are for recording / reproducing section 50, which will be described later.
It is detected by an angular position sensor (photoelectric switch) 36 provided at the position, and is used for controlling the step motor 40 and positioning the disc 20.

A recording / reproducing unit 50 is provided at a predetermined angular position on the disc 20. Further, another predetermined angular position, for example, a position on the opposite side of the recording / reproducing unit 50 as described above is a detachable position of the video floppy F. The video floppy F is inserted from the insertion / removal opening 23 into the bucket 22 which has reached this attachment / detachment position by the rotation of the disc 20. The video floppy F inserted into a predetermined position in the bucket 22 is locked in the predetermined position by a lock mechanism (not shown, a known one) provided in the bucket 22.

A centrifugal force acts on the video floppy F inserted into the bucket 22 when the disc 20 rotates. If the video floppy F is inserted to a predetermined position in the bucket 22 and locked by the lock mechanism, the video floppy F will not fly out of the bucket 22 even if centrifugal force acts. However, since the video floppy F is not fully inserted and is not locked when it is not inserted to the predetermined position of the bucket 22, the video when the disc 20 rotates
The floppy F will fly out of the bucket 22. Even if it is sent to the recording / playback unit 50 without jumping,
If the floppy F is not set at a predetermined position in the bucket 22, chucking of the magnetic disk 18 by the spindle 75, touching of the magnetic head and the regulation plate 63 on the magnetic disk 18 are impossible or not performed properly,
Recording / playback operation cannot be realized.

A device 80 for forcibly pushing the video floppy F, which has not been inserted to a predetermined position in the bucket 22 at the video floppy attachment / detachment position, is provided at an angular position where the motor 40 is provided. The disk 20 is a clock (C
W) direction (rotate in any direction when a predetermined video floppy F is brought to the recording / playback unit 50 for recording / playback). The position where the pushing device 80 is provided is the position next to the video floppy attachment / detachment position (the position separated by less than 36 °) in the clockwise rotation of the disk 20.

In addition to FIGS. 1 and 2, enlarged views of the pushing device 80 of the video floppy are shown in FIGS. 3, 4 and 5. FIG. 3 is a plan view, and FIGS. 4 and 5 are sectional views taken along lines IV-IV and VV of FIG. 3, respectively.

Referring to these drawings, the pushing device 80 has two levers.
Includes 82,92. One lever 82 is rotatably supported by a shaft 83 provided upright on the horizontal member 41, and one end thereof has a shaft 87.
Is provided. A push roller 81 is rotatably provided on the shaft 87. The pushing roller 81 has a V groove 81a,
The upper and lower peripheral edges thereof extend in the radial direction. These peripheral portions will be referred to as flanges 81b and 81c. The height position of the pressing roller 81 is determined so that the V groove 81a is at the same height as the peripheral edge of the disc 20. The lever 82 is urged by a pinching spring 84 in a direction in which the pressing roller 81 moves away from the peripheral edge of the disc 20.
The pinch spring 84 has a coil portion wound around a shaft 83, one end of which is a part of the lever 82 and the other end of which is erected on the horizontal member 41.
85 have been received respectively.

The other lever 92 is provided below the horizontal member 41 and is rotatably supported by a shaft 93 which is similarly fixed to the horizontal member 41. On the other hand, a mounting member 96 is fixed to the support member 42, and a solenoid 91 is provided on the mounting member 96 so as to be rotatable in the horizontal direction at its base end. The rod 91a of the solenoid 91 is rotatably connected to one end of a lever 92 by a pin 95.

A long hole 94 is formed in the other end of the lever 92 in the longitudinal direction thereof, and a pin 86 fixed to the other end of the lever 82 and extending downward passes through the long hole 94. Therefore, the levers 82 and 92 are connected at this other end.

When the solenoid 91 is not operating, the force of the spring 84 causes the pushing roller 81 to be at the outermost position (the position farthest from the peripheral edge of the disc, which is called the retracted position). The push-in roller in the retracted position is shown at 81 (A) using the symbol A.

When the solenoid 91 operates, the one end of the lever 92 is pulled by the solenoid 91, so that the lever 92 swings about the shaft 93, and the lever 82 also swings about the shaft 83 via the pin 86. As a result, the pushing roller 81 is displaced in the direction of the disc 20. The pushing roller 81 can be displaced up to the position shown at 81 (C) in FIG. 3, but the disc shown in FIGS.
At the angular position of 20, the V-shaped groove 81a of the pushing roller 81 comes into contact with a portion other than the arcuate notch 21 on the peripheral edge of the disk 20 (see in particular FIG. 5), so that it is held at the position indicated by 81 (B). .

FIGS. 6 and 7 show a state in which the disc 20 is further rotated clockwise by an appropriate angle and the arcuate notch 21 reaches the position desired by the pushing roller 81. As can be seen from these figures, in the operating state of the solenoid 91, the V-groove 81a of the pressing roller 81 rolls relatively along the peripheral edge of the disk 20 as the disk 20 rotates, When reaching the position of the notch 21, if the video floppy F exists in the bucket 22 provided at the position of the notch 21, the pushing roller 81 has its upper flange 81b on one side of the video floppy F (8
1 (D) roller).

If the insertion of the video floppy into the bucket 22 is incomplete, as indicated by the chain line F ₁ in FIG. 3, when the pushing roller 81 comes to the position of the notch 21, its upper flange 81
b is a result of pushing one side of the video floppy F ₁ by the pulling force of the solenoid 91, the video floppy F ₁ Bucket
It is pushed further into 22 and inserted to the lockable position, so it is locked in that position. Thus, even if there is a video floppy that has not been inserted to the predetermined position of the bucket 22, when the video floppy is sent from the detaching position to the pushing device 80 position by the rotation of the disc 20, The pushing device 80 surely inserts it to a predetermined position.

A switch for detecting whether or not the video floppy F is present in the bucket 22 at the position of the pushing device 80.
98 is provided. The switch 98 is realized by, for example, a limit switch, and is fixed to a mounting member 99 provided on the horizontal member 41. The height position of the actuator of this switch 98 is the lower flange of the pushing roller 81.
It is set to the same height as 81c. Also this switch 98
Is the center of the push-in roller 81 (more precisely, the center of the push-in roller at the position 81 (E) in FIG. 6 described below) and the rotary shaft 30.
The pushing roller 81 which is located on the line connecting the center of the solenoid 91 and which is maximally displaced in the operating state of the solenoid 91 (this is the position shown by the chain line 81 (E) in FIG. 6, which is 81 (in FIG. 3). The actuator is operated by the same position as that shown in (C)), and is provided at a position where the actuator is not operated by the push-in roller 81 (for example, 81 (D)) located at a position further outward than this.

Therefore, with the solenoid 91 activated,
When the disk 20 rotates and the notch 21 reaches the position of the roller 81, if there is a video floppy F in the bucket 22 corresponding to the notch 21, it is the same (even in the incompletely inserted state).
When the video floppy F is not present, the switch 98 is actuated to output a detection signal indicating that the video floppy is not present.

The pushing operation of the incompletely inserted video floppy by the pushing device 80 and the checking operation of the presence or absence of the video floppy by the switch 98 described above are performed, for example, when the power of this autochanger is turned on or when the floppy exchange mode (for the operation in this mode, Will be described later in detail). In another mode, for example, the recording / reproducing mode, the solenoid 91 does not operate and the pressing roller 81 is placed in the retracted position described above.

Returning to FIG. 1 and FIG. 2, in the recording / reproducing unit 50, shafts 52 and 53 are rotatable in parallel with each other at the rear portions of the left and right side plates 51 constituting the frame fixed to the bottom plate 1. Is crossed over. The shaft 52 has two gears 54
Two gears 55 are fixed to the shaft 53 at regular intervals. These gears 54 and 55 mesh with each other.

Both sides of the support plate 60 holding the upper drive unit are bent downward to form side plates. This side plate forms a rearwardly extending arm 61 and is fixed to the outer surface of the gear 54. The regulation plate mechanism held by the support plate 60 includes a regulation plate 63 and a holder 64 thereof. The regulation plate 63 is a holder
The holder 64 is fixed to the support plate 64 by a coil spring 65.
Held at 60.

The support plate 70 that holds the lower drive unit is a mounting member 71.
It is fixed to the gear 55 by. A long hole 72 is formed in the arm portion of the mounting member 71, and the inside of the long hole 72 is a shaft.
52 passes. As will be described later, the mounting member 71 is driven to swing, but the elongated hole 72 prevents interference with the shaft 52.

On the support plate 70, a rotary drive unit for rotationally driving the magnetic disk 18, and a head transfer unit for transferring a magnetic head (which is hidden by the spindle 75 and not visible in FIG. 2) in the radial direction of the magnetic disk 18 ( (Not shown) is provided. The rotary drive unit includes a motor 76 having a spindle 75, a frequency generator for outputting a frequency signal representing the number of revolutions of the motor 76, a board on which a motor control circuit is assembled, and the like. The spindle 76 and the magnetic head of the motor 75 project above the support plate 70. The head transfer unit includes a step motor, a mechanism for movably holding the magnetic head, a mechanism for converting the rotation of the step motor into a linear motion of the magnetic head, and the like.

Positioning pins 73 are provided upright at the tip of the support plate 70, and positioning pins 74 are provided upright at other appropriate positions. Locating pin 73
In order to accurately adjust the angular position of the disc 20 to the position of the support plate 70 after the rotation of the disc 20 by the step motor 40 by the pin 73 passing through the above-mentioned positioning hole 27 of the disc 20. belongs to. Positioning pin 74 is video
The floppy F is positioned. The upper portion of each of the pins 73 and 74 is tapered.

The upper support plate 60 is located above the disc 20, and the lower support plate 70 is located below the disc 20. One of the support plates 60, 70, for example, the lower support plate 70 is rockably driven by a rocking drive mechanism (not shown). Gear 54
And 55 are meshed with each other, so that when one support plate is swung, the other support plate is also swung in conjunction with this, and these support plates 60 and 70 move toward or away from each other.

Further, the angular position sensor 36 described above is fixed to the frame of the recording / reproducing unit 50. The angular position sensor 36 is detected when the shift pulse given to the step motor 40 for rotationally driving the disk 20 and the slits 33, 34 are detected.
FIG. 9 shows the pulse signal output from the device.
The step motor 40 has 120 shifts in this embodiment.
When a pulse is applied, the disc 20 rotates θ = 36 °. The distance between the slit 33 and the auxiliary slit 34 at the home position HP corresponds to 12 shift pulses.

FIG. 10 shows an outline of an electrical configuration of a portion for controlling the rotation of the disc 20, pushing in of the incompletely inserted floppy, and confirming the presence / absence of video floppy. Controller 111
Is composed of CPU, memory, etc. Angular position sensor 36
Output pulse is input as an interrupt signal to the CPU of the control device 111. The control device 111 outputs a shift pulse for driving the step motor 40, and the motor drive circuit 112 converts the shift pulse into A, B, and phase drive pulses and supplies them to the step motor 40. The control device 111 also includes a drive device 113 including the solenoid 91, the swing drive mechanism for driving the support plates 60, 70, a spindle motor provided on the support plates 60, 70, a head transfer mechanism, and the like. Drive unit 114
Drive control. Further, a video floppy presence / absence signal from the switch 98 is given to the controller 111. An input device 115 including a keyboard for inputting an identification code (number) of the video floppy and setting various modes is also connected to the control device 111.

The rotation control of the disc 20 is performed as follows. It is assumed that a certain set position SP is in the recording / playback unit 50. That is, it is assumed that a certain slit 33 is detected by the position sensor 36. From this state, control device 111
When 120 shift pulses are applied to the step motor 40 by the, the motor 40 rotates by a predetermined angle and the disc 20 rotates by θ.
= 36 ° rotation, the next set position SP reaches the recording / reproducing section 50, and the slit 33 is detected by the sensor 36. The control device 111 recognizes that the next set position SP has been positioned in the recording / reproducing unit 50 by confirming that there is an interrupt due to the detection pulse output from the sensor 36.

When the home position HP reaches the recording / playback unit 50, a pulse signal based on the detection of the auxiliary slit 34 before and after the home position HP is output from the sensor 36, and this pulse signal is about the same as the pulse signal based on the detection of the slit 33. Since it is output at the position before and after 12 shift pulses, the control device 111
Can recognize that. This home position HP is used as a reference position when assigning a bucket number to the bucket 22.

FIG. 8 shows the relationship between the bucket No. of the bucket 22 on the disk 20 and each position, that is, the recording / reproducing position, the detaching position, and the pushing position. Bucket of bucket 22 at home position HP (position of slit 33 with auxiliary slit 34)
In this embodiment, the No. is set to No. 1, and consecutive numbers sequentially increasing from this position HP in the counterclockwise direction are assigned to each bucket 22 up to No. 10. When the No. 1 bucket is at the recording / playback position, the No. 6 bucket is at the video floppy attachment / detachment position, and the No. 5 bucket is at the push position of the pushing device 80 (and the video floppy presence / absence confirmation position). ) (In CW rotation). The angle from the attachment / detachment position to the angle position where the switch 98 is provided is α (<36
゜). This angle α corresponds to a shift pulse for driving a certain number of motors 40 less than 120.

FIG. 11 shows a correspondence table between the bucket number provided in the memory of the control device 111 and the identification code of the video floppy F inserted in the bucket. In the floppy exchange mode, this table is created by storing the identification code of the video floppy input by the input device 115 for each bucket 22 which has reached the detaching position and in which the video floppy has been exchanged or newly inserted. . In the exchange mode of the video floppy F, the disc 20 is intermittently rotated by 36 ° in the clockwise direction. At this time, the presence / absence confirmation process of the video floppy is also performed. The result of this confirmation processing (the presence or absence of video floppy) is stored in the above table in correspondence with the bucket number.

FIG. 12 shows an outline of the procedure of the video floppy presence / absence confirmation processing executed by the CPU of the control device 111.

First, the disk 20 is rotationally driven, and the home position HP is positioned at the recording / reproducing position based on the detection signal from the position sensor 36 (step 121). Then solenoid 9
1 is driven, and the pushing roller 81 is biased in a direction approaching the peripheral edge of the disc 20 (step 122).

From this state, the disc 20 is rotationally driven in the clockwise direction and the number of shift pulses given to the step motor 40 for rotating the disc 20 is counted (step 123). When the counted number of shift pulses reaches a value corresponding to the angle α (step 124), the presence or absence of video floppy is judged based on the output signal from the switch 98 (step 125), and the result is obtained. Is stored for the corresponding bucket No. in the above table of the memory (the bucket No. that was previously in the attachment / detachment position: deviated from the bucket No. in the recording / reproducing position by 5) (steps 126 and 127).

After this, the sensor 36 based on the detection of the slit 33 or 34
Since there is an interrupt from, the angle position that reaches the recording / playback position is the home position HP or the other set position SP depending on the relationship with the shift pulse number at this time, as described above. Is determined (step 128,
129,130). If it is the set position SP, the rotation of the disk 20 is temporarily stopped and the count value of the shift pulse is cleared (step 131). Then, the process returns to step 123 and the above-mentioned processing is repeated.

At the detaching position when the disk 20 is temporarily stopped, the video floppy may be inserted or replaced, and its identification code may be input.

When the processing of steps 123 to 131 is repeated 10 times, the home position HP of the disk 20 is positioned at the recording / reproducing position. If this is confirmed (step 129), the driving of the solenoid 91 is stopped. When the pushing roller 81 returns to the retracted position, the rotation of the disc 20 is stopped (step 13).
2).

In the process of FIG. 12, the state of the switch 98 is read at the time when the number of shift pulses corresponding to the angle α is counted, but the flip-flop set by the output of the switch 98 is read.
If a storage element such as a flop is provided, the disk 20 will have an angle α.
Since the state of the switch 98 is stored in the memory element when it is rotated, it is sufficient to read the memory of this memory element before the disk 20 is rotated by 36 °. And step
At 131, this storage element may be reset.

Or 1 for every 120 shift pulses
It is also possible to provide a storage device such as a shift register that shifts by stages and store the state of the switch 98 in this storage device sequentially.

Further, the solenoid 91 is driven at the beginning of the above process,
Although the buckets 22 are continuously driven as they are, they may be driven at the timing when each bucket 22 reaches the pushing position, and may be driven only until the bucket 22 passes the position.

Finally, the operation of the auto changer in the recording / reproducing mode will be described with reference to FIGS.

When the recording / reproducing unit 50 is performing the recording or reproducing process, the support plates 60 and 70 are in the closed state as shown by the solid line in FIG.

When the video floppy F to be recorded / reproduced in the recording / reproduction unit 50 is exchanged, the supporting plate 70 is oscillated by the oscillating mechanism in the direction shown by the chain line in FIG. As the support plate 70 swings, the gear 55 of the shaft 53 rotates counterclockwise. Since the gear 54 meshes with the gear 55, the gear 54 rotates clockwise, which causes the support plate 60 to swing and rise to the position indicated by the chain line. In this way, both support plates 60 and
70 and 70 open, ie move away from each other.

In this state, the recording / reproducing section 50 exchanges the video floppy F. That is, the step motor 40 is provided with 120 or an integer multiple of this shift pulse, and a predetermined (for example, the next if 120) video floppy F reaches the position of the recording / reproducing section 50. At this time, the disc 20 may be rotated clockwise or counterclockwise. Further, it is confirmed by the detection signal of the sensor 36 that the set position has reached the recording / reproducing unit 50. When the disc 20 stops at a predetermined angular position, the swing mechanism swings the support plate 70 upward. Support plate 60, 70 is disk 20
Approach each other from the front and back. The spindle 75 fixed to the support plate 70 enters from the opening 25 of the disc 20 to chuck the magnetic disk 18 of the video floppy F. Also,
The magnetic head is a magnetic disk 18 in the video floppy F.
Touch gently. Positioning pins set up on the support plate 70
74 enters the hole 13 of the video floppy F in the bucket 22 through the hole 26 of the disc 20 and positions the video floppy F. Further, the positioning pin 73 of the support plate 70 protrudes to the front side through the hole 27 of the disc 20 so that the disc 20 can be positioned more accurately as described above (at this time, the step motor 40 is weakly excited). State or unexcited state). The regulation plate 63 of the support plate 60 is provided at the opening 24 of the bucket 22.
Through the window 14 of the video floppy F and contact the magnetic disk 18.

In the above embodiment, the video floppy, which was not completely inserted into the bucket 22, is pushed to the lock position by the pushing device 80 as the disc 20 rotates. When the predetermined recording medium holding mechanism (bucket) reaches the position of the pushing device, the rotation of the disk 20 is stopped, and the pushing portion (pushing roller 81) of the pushing device is projected toward the recording medium to hold the recording medium. It may be pushed to a predetermined position of the mechanism. At this time, the pushing device is preferably arranged at a position (an integer of 1 is preferable for 36 ° × n: n in the above embodiment) which is an integral multiple of the holding mechanism interval from the mounting / demounting position of the recording medium. This makes it possible to perform the pushing operation when the disc is stopped for inserting / removing the recording medium or for recording / reproducing, and it is necessary to purposely stop the disc (moving body) for the pushing operation. This saves time and simplifies control. It goes without saying that such a pushing device can also be provided with the recording medium checking device according to the present invention. Device for detecting the presence or absence of the recording medium when the disk is stopped (detection switch 98)
Read the output signal of. The photo sensor 101 shown in FIGS. 13 and 14 can also be arranged at a similar angular position.

[Brief description of drawings]

FIG. 1 and FIG. 2 show an outline of the whole mechanical structure of the auto changer in the magnetic recording / reproducing apparatus. FIG. 1 is a plan view thereof, and FIG. 2 is a line II-II of FIG. FIG. FIG. 3 is an enlarged view of a part of the auto changer, and is a plan view of the pushing device portion, and FIG. 4 is a plan view of FIG.
FIG. 5 is a sectional view taken along line IV-IV, and FIG. 5 is a sectional view taken along line VV in FIG. FIG. 6 is a plan view showing a state in which the disc further rotates and the pushing roller reaches the arcuate notch, and FIG. 7 shows VI in FIG.
It is a sectional view taken along line I-VII. FIG. 8 is a plan view showing the relationship between bucket No. of the bucket on the disk and each position. FIG. 9 shows the shift pulse applied to the step motor and the output signal of the angular position sensor. FIG. 10 is a block diagram showing an outline of an electrical configuration of a device for performing rotation control of the disc, pushing operation, floppy presence / absence confirmation operation, and the like. FIG. 11 shows a correspondence table between the bucket number and the floppy identification code in the memory. FIG. 12 is a flow chart showing the processing for confirming the presence / absence of video floppy. 18 …… magnetic disk (recording medium), 20 …… disk (moving body), 22 …… bucket (holding mechanism), 30 …… rotating shaft, 80 …… pushing device, 81 …… pushing roller, 82, 92 …… Lever, 91 …… Solenoid, 98 …… Video floppy presence / absence detection switch (recording medium presence / absence detection device), 101 …… Video floppy presence / absence sensor (recording medium presence / absence detection device), 111 …… Control device, F: Video floppy (recording medium).

Claims (1)

[Claims] 1. A plurality of holding mechanisms for detachably holding a recording medium are provided on a moving body along one edge thereof, and an insertion / removal opening of the holding mechanism is directed toward the edge of the moving body. The moving body is moved by a drive device so that all the holding mechanisms of the moving body sequentially pass through the recording medium attachment / detachment position and the recording / reproducing position. A pushing device having a pushing member for pushing the recording medium held by the holding mechanism is provided at a position between the attaching / detaching position and the recording / reproducing position in the vicinity of the path through which the holding mechanism passes; The pushing member is urged toward the edge of the moving body in a direction substantially orthogonal to the movement path of the holding mechanism, and a depression is formed at the edge of the moving body where the holding mechanism is provided. The recording medium is formed. The one side can be inserted into the holding mechanism until it reaches an intermediate position between the movement path of the edge of the moving body and the recess, and the pushing member moves with the movement of the moving body. An apparatus for detecting the presence / absence of a recording medium, which is operated by the pushing member toward the recess of the moving body when there is no recording medium in the holding mechanism along the edge and the one side of the recording medium held in the holding mechanism. The device for checking the recording medium in the auto changer, which is equipped with.