JPH01119953A - Automatic changer for recording medium - Google Patents

Abstract

PURPOSE:To control the noise and oscillation of a rotational body and to attain accurate positioning by using a step motor as the rotary driving means of the rotational body and transmission power from the stepping motor to the rotational body through the use of a timing belt. CONSTITUTION:The stepping motor 40 for rotating and driving a disk 20 is disposed on a position slightly apart from the rotary shaft 30, and a belt vehicle 44 whose teeth are formed is fixed to the output shaft 40a of the stepping motor 40. The teeth are generated on a belt vehicle 31 where the disk 20 is fixed. The timing belt 45 is suspended between the belt vehicles 44 and 31, and the stepping motor 40 rotates and drives the disk 20. Thus, the timing belt 45 operates as a buffer material, and it can prevent noise and oscillation. Furthermore, the occurrence of oscillation is controlled and the step out of the stepping motor 40 is hardly to occur, whereby the positioning precision of the rotational body 20 can be highly held.

Description

DETAILED DESCRIPTION OF THE INVENTION Summary of the Invention In an auto changer in which a rotating body that holds a plurality of recording media at constant angular intervals on the circumference rotates between a recording medium loading/unloading position and a recording/reproducing position, A step motor is used as a rotation drive means for the rotating body, and a step motor is
A timing belt is used to transmit power from the motor to the rotating body.

Background of the Invention This invention moves a recording/reproducing head in the radial direction of a rotating recording medium (magnetic disk, magneto-optical disk, optical disk, etc.) to record a signal on an arbitrary track, and to record a signal from an arbitrary track. A recording/playback device that performs playback, or both recording and playback, holds a large number of recording media and automatically moves them to the recording/playback position.
This invention relates to an auto changer that can change the recording medium being played back.

The applicant has already proposed an auto changer capable of automatically and quickly exchanging a plurality of recording media (Japanese Patent Application No. 82-110484). This auto changer is
It includes a rotating body equipped with a plurality of mechanisms for detachably holding a recording medium at equal angular intervals on its circumference. This rotating body rotates at high speed in order to quickly float a predetermined recording medium to a recording/reproducing position or a recording medium loading/unloading position. Since rotating bodies are relatively heavy, high torque is required to drive them.

Furthermore, since the recording medium must be positioned at a predetermined position with high precision, accurate rotational control is required.

Pulse motors are suitable for high-precision positioning, and from an economical point of view, two-phase or four-phase pulse motors are considered preferable. When the rotational force of this pulse motor is transmitted to the rotating body via a gear mechanism, there is a problem that noise and vibration increase. This is because, microscopically, a two-phase or four-phase pulse motor does not move continuously but intermittently.

This is also because a rotating body tends to become a vibration resonator.

If the vibration is large, the motor will become unstable during stepping, making it difficult to perform highly accurate positioning. The use of a five-phase step motor, which rotates smoothly, can be considered, but this type of motor is expensive.

SUMMARY OF THE INVENTION An object of the present invention is to provide an auto changer that can suppress noise and vibration of a rotating body that holds and rotates a plurality of recording media, and that can perform accurate positioning.

In the recording medium auto changer according to the present invention, mechanisms for removably holding the recording medium are arranged at equal angular intervals on the circumference, and a recording medium attachment/detachment position provided at a first predetermined angular position and a second recording medium attachment/detachment position are provided. A step motor for rotationally driving two rotating bodies that rotate between a recording/reproducing position of a recording medium provided at a predetermined angular position, and a step motor.
A first belt pulley provided on the output shaft of the motor and provided with teeth, a second belt pulley provided on the rotating shaft of the single rotating body and provided with teeth, and a timing applied to these belt pulleys.・It is characterized by being equipped with a power transmission mechanism consisting of a belt.

According to this invention, since the timing belt is used as a means for transmitting the rotational power of the step motor to the rotating body, the timing belt acts as a buffer material and can suppress noise and vibration. Since the motor adjustment is less likely to occur during stepping, the positioning accuracy of the rotating body can be maintained at a high level. It is also economically advantageous because a two-phase or four-phase step motor can be used instead of an expensive five-phase motor.

This invention applies to recording media magnetically and magneto-optically.

It is applied to an auto changer of a recording/playback device that performs either recording or playback optically or in other ways.

DESCRIPTION OF EMBODIMENTS An embodiment in which the present invention is applied to an auto changer in a magnetic recording/reproducing apparatus will be described below with reference to one drawing.

1 and 2 are schematic diagrams showing the entire mechanical configuration of an auto changer in a magnetic recording/reproducing device, with FIG. 1 showing the plane, and FIG. Each line shows the cross section. Also, in Figure 1,
Bucket 22, indicated by arrow A, is shown in dashed lines to indicate the video floppy F contained therein, and at the location indicated by arrow B, packets have been removed to indicate the configuration of disk 20 at that location. , only the video floppy F is shown in dashed lines.

- Referring to these drawings, a magnetic disk 1B is rotatably housed in a jacket 11 of a video floppy F (magnetic recording medium) that is installed in a magnetic recording/reproducing device. The disk or hub (core) 19 is located at the center of the magnetic disk 18.

It extends into the center hole 12 of the jacket 11. Windows 14 are opened in part of both sides of the jacket 11 to expose the recording/reproducing area of the magnetic disk 18 to the outside. This window 14 is normally closed by a shutter 15, but when the window 14 is inserted into a packet 22, which will be described later, the shutter 15 is automatically opened by an opening/closing mechanism (path shown) provided in the packet 22.

In addition, holes 13 are provided at several locations in the jacket 11 for receiving positioning bins 74 (to be described later) for positioning and fixing the video floppy disk F within the packet 22.

A disc 20 for holding such a video floppy F is fixed to a belt pulley 31 fixed to a two-rotation shaft 30. The rotating shaft 30 has a mounting surface on the bottom plate 1.

It is rotatably supported by a fixed bearing stand 35.

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

A horizontal member 4 is extended and fixed between the support member 42 fixed to the bottom plate 1 and the bearing stand 35 mentioned above. 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 oval holes 49 through which the screws are passed, and a large oval hole 48 through which the output shaft 40a of the step motor 40 projects upward. By forming the oval hole 49, the mounting position of the step motor 40 can be adjusted.

A belt pulley 44 with teeth is fixed to the output shaft 40a of the step motor 40. Teeth are also formed on the belt pulley 31 to which the first disc 20 is fixed. A timing belt 45 is placed between these belt pulleys 44 and 31, whereby the disc 20 is rotationally driven by the step motor 40. In this way, since the timing belt 45 is used as a means for transmitting the rotational power of the step motor 40 to the disk 20, the timing belt 45 acts as a buffer material and can suppress noise and vibration. . The step motor 40 itself has a high positioning accuracy, and since the occurrence of vibration is suppressed, the step motor 40 is less likely to be distorted, so that the positioning accuracy of the rotating body 20 can be maintained at a high level.

The lower peripheral edge of the belt pulley 31 extends outward like a brim (32
), a radial slit 33 is formed at each angular position where the packet 22 is provided. This slit 33 is detected by a photoelectric switch 3B provided in a recording/reproducing section 50, which will be described later. Due to this, 2
The disk 20 is accurately positioned in its angular position. That is, a predetermined packet 22 on one disk 20 is positioned at a correct position in the recording/reproducing section 50. .

A plurality of packets 22 (ten in this embodiment) containing video floppies F are fixed onto the disk 20 with screws. These packets 22 are.

They are arranged radially on the same circumference at equal angular intervals. The outer end surface of the packet 22 is completely opened and cut in an arc shape for inserting a video floppy F.
The opening position and cutout are shown at 23). Also packet 2
2 has a large notch in its upper surface, and an opening 24 is formed therein. The window 14 and center hole 12 of the attached video floppy F are exposed through the opening 24.

Disc 2 at a position corresponding to opening 24 of packet 22
0 is also provided with an opening 25. The opening 25 is longer than the opening 24 of the packet 22. packet 2
2 reaches the recording/reproducing section 50 described later and the recording/reproducing operation is started, the opening 24 and the window 14 are opened from above.
The regulating plate 83 enters through the magnetic disk 18 and comes into contact with the upper surface of the magnetic disk 18 . The magnetic head enters from below through the opening 25 and the window 14 to reach the lower surface of the magnetic disk 18 (recording/recording/
(playing surface).

Furthermore, a spindle 75 of a motor 76 which will be described later and rotates the magnetic disk 18 also advances into the opening 25 of the disk 20.

On the outer peripheral edge of the disk 20, a similar arcuate notch 21 is formed at the position where the packet 22 is provided, corresponding to the arcuate notch 23 of the packet 22. These notches 21 and 23 are located at the attachment/detachment position of the video floppy F (arbitrary position, for example, the position where the video floppy F is shown away from the disc 20 in FIG. Point symmetrical position around axis 30)
This is to facilitate attachment and detachment of the video floppy F to the packet 22. A portion of the video floppy F attached to the bucket 22 is exposed to the outside through these notches 21 and 23, so the video floppy F can be attached or detached by hand or using the attachment/detachment mechanism. can. Notch 21 for one packet 22
．． 23 may be provided one at a time, or may be provided in plural numbers.

The disk 20 further includes a hole 2B through which a positioning pin 74 passes.

A hole 27 is bored through which the positioning pin 73 passes.

A recording/reproducing section 5o is located at a predetermined angular position on the disk 20.

Further, another predetermined angular position, for example, as described above, a position substantially opposite to the recording/reproducing section 50 is a position for attaching and detaching the video floppy F. Video floppy F is disk 2
The packet 22 is inserted through the opening 23 into the packet 22 which has reached this attachment/detachment position by the rotation of 0. .

After insertion, the video floppy F is locked by a locking mechanism (path shown) provided in the packet 22.

In the recording/reproducing section 50, at the rear of the left and right side plates 51 constituting the frame fixed to the bottom plate 1.

The shafts 52.5g are horizontally mounted parallel to each other and rotatable. Two gears 54 are fixed to the shaft 52, and 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 extends rearward to form an arm at and is fixed to the outer surface of the gear 54 mentioned above. The regulating plate mechanism held by this support plate BO includes a regulating plate B3 and its holder B4. The regulation plate 63 is fixed to the holder 84.

Holder B4 is held on support plate 6o by coil spring B5.

The support plate 70 that holds the lower drive unit is the mounting member 7
1 to the gear 55. This mounting member 7
An oval hole 72 is bored in the arm portion of the first arm, and the shaft 52 passes through the oval hole 72. As will be described later, the scrap material member 71 is driven to swing, but this oval hole 7
2 prevents interference with the shaft 52.

A rotary drive unit 2 for rotating the magnetic disk 18 and a magnetic head (hidden behind the spindle 75 in FIG. 2) are mounted on the support plate 70 .
Head transfer unit for radial transfer (path shown)
is provided. Rotation drive unit is spindle 75
It includes a motor 76 having a motor 76, a frequency generator that outputs a frequency signal representing the number of rotations of the moaner 7G, a board on which a motor control circuit is assembled, and the like. Spindle 7B of motor 75
And the magnetic head protrudes 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 linear motion of the magnetic head, and the like.

A positioning pin 73 is provided at the tip of the support plate 70, and positioning pins 74 are provided at other appropriate locations. The positioning pin 73 is used to precisely align the angular position of the disc 20 with the position of the support plate 70 after the step motor 40 rotates the disc 20 by passing the pin 73 through the hole 27 of the disc 20. belongs to. The positioning pin 74 is for positioning the video floppy F. Both pins 71 and 74 have tapered upper portions.

Such an upper support plate 60 is above the disk 20.

The lower support plates 70 are located below the discs 20, respectively. The support plates 60 and 7 are supported by a swing drive mechanism (not shown).
0, for example, the lower support plate 7°, is driven to swing. Since the gears 54 and 55 are in mesh with each other, when one support plate is swung, the other support plate is also swung, and these support plates BO and 70 move toward or away from each other.

Furthermore, the above-mentioned photoelectric switch 36 is fixed to the frame of the recording/reproducing section 50. The rotation of the step motor 40 is controlled based on the detection signal from the photoelectric switch 36, and the predetermined packet 22 and the video data therein are controlled.
The floppy disk F is positioned in the recording/reproducing section 50.

When the recording/reproducing section 50 is performing recording or reproducing processing, the support plates 80 and 70 are in a closed state as shown by solid lines in FIG.

When replacing the video floppy disk F, the support plate 70 is driven to swing in the direction shown by the chain line in FIG. 2 by the swinging mechanism described above. As the support plate 70 swings, the gear 55 of the shaft 53 rotates counterclockwise. Since the gear 54 meshes with the gear 55, it rotates clockwise, and as a result, the support plate 60 swings and rises to the position indicated by the chain line. In this way, the two support plates 60 and 70 open, that is, move away from each other.

In this state, the video floppy F in the recording/reproducing section 50 is replaced. That is, the disc 20 is rotationally driven by the motor 40 until a predetermined (for example, the next) video floppy F comes to a predetermined position in the recording/reproducing section 50 (that is, until a predetermined slit 33 is detected by the photoelectric switch 36). Ru.

When the disk 20 stops at a predetermined angular position, the swing mechanism swings the support plate 70 upward. The support plates 60 and 70 approach each other from the front and back of the disc 20. A spindle 75 fixed to the support plate 70 enters through the opening 25 of the disk 20 and chucks the magnetic disk 18 of the video floppy F. Also, the magnetic head gently contacts the magnetic disk 18 in the video floppy F. The positioning pins 74 are set up on the support plate 70.

The video floppy F is inserted into the hole 13 of the video floppy F in the packet 22 through the hole 2G of the disk 20, and the video floppy F is positioned. The positioning pin 73 of the support plate 70 is connected to the disc 20
By protruding outward through the hole 27, more accurate angular positioning of the disc 20 is achieved (at this time, the step motor 40 is in a weakly energized state or in a non-energized state). The regulating plate 63 of the support plate 60 is.

Through the opening 24 of the packet 22, the video floppy F
The magnetic disk enters the inside through the window 14 and comes into contact with the magnetic disk 18.

[Brief explanation of the drawing]

Figures 1 and 2 schematically show the overall mechanical configuration of an autochanger in a magnetic recording/reproducing device, with Figure 1 being a plan view, and Figure 2 taken along the line ■-■ in Figure 1. This is a cross-sectional view. 1B...Magnetic disk (recording medium). 20...Disc (rotating medium). 22...Packet. 30...Rotation axis. 31, 44... Toothed belt wheel. 40... Disc drive step motor. 40a...Motor output shaft. 45...Timing-belt. F...Video floppy (recording medium). that's all

Claims (1)

[Scope of Claims] A mechanism for removably holding a recording medium is arranged at equal angular intervals on the circumference, and has a mechanism for attaching and detaching the recording medium provided at a first predetermined angular position and a second predetermined angular position. A rotating body that rotates between a recording/reproducing position of a recording medium provided therein, a step motor for rotationally driving the rotating body, and a first motor provided on the output shaft of the step motor and having teeth formed thereon. A power transmission mechanism comprising a belt pulley, a second belt pulley provided on the rotating shaft of a rotating body and provided with teeth, and a timing belt hooked around these belt pulleys. Auto changer.