JP2724928B2 - Abnormal operation prevention device for recording medium cartridge transporter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for preventing abnormal operation of a recording medium cartridge transporter, and more particularly to a device for transporting a recording medium cartridge in a library apparatus of a recording medium cartridge when the transporter should be stopped. The present invention relates to a device that can surely prevent the user from starting moving.

[0002]

2. Description of the Related Art An optical disk library device (hereinafter, OLU)
Is a device that stores an optical disk cartridge (hereinafter, referred to as a cartridge) and reads or reads / writes it. A storage rack provided with a plurality of storage cells that store the cartridge, and a drive that reads / reads / writes the cartridge And a cartridge transporter which is provided so as to be movable vertically and horizontally by a servo mechanism and transports the cartridge between the storage cells, the drives and the like.

In such an OLU, for example, when a cartridge is transported from a storage cell to a drive, the cartridge transporter is moved vertically by the servo mechanism to the position of the storage cell storing the corresponding cartridge. With the cartridge stopped at the position of the storage cell, a cartridge to be transported is taken in from the storage cell. Next, the cartridge carrier holds the cartridge taken in from the storage cell, is moved up and down to the drive position by the servo mechanism, and sends out the cartridge to the drive in a state where the cartridge is stopped at the drive position. It will be.

[0004]

However, with the cartridge carrier stopped as described above, the storage cell,
When a cartridge is inserted into or removed from a drive or the like, the cartridge carrier may suddenly start moving in the vertical direction due to, for example, an abnormality in a servo mechanism.
If the cartridge carrier starts to move while the cartridge is being loaded or unloaded as described above, the cartridge,
Serious damage, destruction, and the like will occur in the cartridge carrier and other mechanical parts. SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has an abnormal operation of a recording medium cartridge transporter that can reliably prevent a transporter that transports a recording medium cartridge from suddenly starting to move when it should be stopped. It is intended to provide a prevention device.

[0005]

In order to solve the above-mentioned problems, an apparatus for preventing abnormal operation of a recording medium cartridge transporter according to the present invention includes a cartridge accommodating section, a cartridge drive for reading or reading / writing from / to a recording medium cartridge, and The cartridge carrier is movable between the cartridge accommodating section and a cartridge drive or the like, and includes a cartridge carrier for carrying a recording medium cartridge, and driving means for moving the cartridge carrier. And a recording medium cartridge library apparatus which stops at a predetermined position corresponding to a cartridge drive or the like, and inserts or removes a recording medium cartridge from or to the cartridge storage portion, the cartridge drive, or the like in a state where the cartridge is stopped at that position. Strange Measuring means for measuring the amount, definitive when the cartridge conveying body should be in a stopped state,
Specifying means for specifying an allowable displacement amount of the cartridge carrier, and that the displacement amount measured by the measuring means exceeds the allowable displacement amount when the cartridge carrier is to be in a stopped state. And control means for stopping the operation of the driving means in accordance with the detection of the detecting means.

[0006]

The measuring means successively measures the amount of displacement occurring in the stopped recording medium cartridge transport. The designating means designates an allowable displacement amount of the cartridge carrier when the cartridge carrier is to be stopped. If the cartridge carrier is largely displaced due to an abnormality of the driving means even though it should be in the stopped state, the displacement measured by the measuring means is:
This will exceed the allowable displacement. In such a case, the detecting means detects that the displacement measured by the measuring means exceeds the allowable displacement. The control means forcibly stops or cuts off the operation of the drive means when the detection means detects that the measured displacement amount exceeds the allowable displacement amount, and conveys the recording medium cartridge. Keep your body still. With this configuration, it is possible to reliably prevent the recording medium cartridge transporter from suddenly starting to move due to an abnormality in the drive unit while the recording medium cartridge is being inserted into or removed from the cartridge storage unit or the cartridge drive. You can do it. Further, a situation in which the recording medium cartridge transport body suddenly starts to move due to an initial failure of the driving unit when the driving unit is turned on,
This can be prevented by a similar configuration.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 2 schematically shows an OLU using an apparatus for preventing abnormal operation of a recording medium cartridge transporter according to an embodiment of the present invention. The OLU includes a storage rack 3 having a plurality of storage cells 2 for storing cartridges, and a drive 4 for reading and writing cartridges.
And a cartridge carrier 5 that is movable in the vertical direction (indicated by arrow V) and the left and right (indicated by arrow H) and transports the cartridge between the storage cell 2 and the drive 4. Consists of The vertical movement of the cartridge transport body 5 during the transport of the cartridge, that is,
The ascending or descending is performed by a servo mechanism.

In the servo mechanism, the servo motor M
Moves the cartridge carrier 5 upward by one direction rotation and lowers the cartridge carrier 5 by rotation in the other direction via the belt 8 connected to the cartridge carrier 5. The cartridge carrier 5 rises in this way,
By being lowered, the cartridge can be transported, for example, between the storage cells 2 or between the storage cells 2 and the drive 4.

The position sensor S comprises, for example, an optical incremental encoder.
The number of pulses corresponding to the amount of rotational displacement of the cartridge carrier 5, that is, the amount of displacement of the cartridge carrier 5 in the vertical direction, is output as a detection signal. The rotation of the servo motor M is controlled by the position sensor S
Is controlled based on the detection signal, and the cartridge transporter 5 is stopped in a state where it is accurately positioned at a desired position such as the storage rack 3 or the drive 4 by such servo control.

The position sensor S outputs a detection signal composed of two-phase signals having a different phase relationship in accordance with the rotation direction of the servo motor M, that is, the rise and fall of the cartridge carrier 5. That is, as shown in FIG. 3, the position sensor S outputs the A-phase signal B as shown in FIG.
A detection signal whose phase is advanced from the phase signal is output.
In response to the rotation in the direction of lowering the A, the B-phase signal outputs a detection signal whose phase is advanced from the A-phase signal.

FIG. 1 is a block diagram showing an example of the configuration of the abnormal operation preventing device for preventing the cartridge carrier 5 to be stopped in the OLU from suddenly starting to move due to a servo system abnormality or the like. . In the abnormal operation prevention device, the waveform shaping circuit 10 captures a two-phase detection signal output from the position sensor S of the servo mechanism from the time when the cartridge carrier 5 stops at a desired position as described above, The waveform is shaped by removing the noise component of the detection signal. The waveform-shaped detection signal is output to the pulse detection circuit 11.

The pulse detection circuit 11 includes a waveform shaping circuit 10
From the phase relationship between the A-phase signal and the B-phase signal of the detection signal input from the CPU, it is determined whether the detection signal is related to the upward displacement or the downward displacement of the cartridge carrier 5, and the determination result According to the detection signal,
A pulse relating to the upward displacement of the cartridge transport 5 (hereinafter, an upward displacement pulse);
A pulse related to the downward displacement (hereinafter, referred to as a downward displacement pulse) is detected, and the detected upper displacement pulse and lower displacement pulse are output to the pulse count circuit 13.

The pulse count circuit 13 sequentially counts up and down the upper displacement pulse and the lower displacement pulse supplied from the pulse detection circuit 11 (ie, for example, adds the upper displacement pulse and subtracts the lower displacement pulse).
I do. By such an up / down count, the pulse count circuit 13 measures how much the upward or downward displacement of the cartridge carrier 5 to be stopped as a whole has been measured. The count value is the measured value. The current count value CN of the pulse count circuit 13 is given to the allowable value over detection circuit 14 every moment.

When the cartridge carrier 5 stops at a desired position, the allowable value over detection circuit 1
4 shows the count value C of the pulse count circuit 13 when the cartridge carrier 5 should be stopped.
The maximum allowable count value UCN and the minimum allowable count value LCN defining the allowable range of N are loaded. In other words, these maximum allowable count values UC
N and the minimum permissible count value LCN are determined by the number of cartridges 5 when the cartridges 5 should be stopped.
Is set for the allowable vertical displacement amount of. The reason for setting the allowable vertical displacement amount in this manner is that, for example, when a cartridge is inserted into or taken out of the storage cell 2, the drive 4, or the like, the cartridge carrier 5 necessarily has a certain amount of vertical displacement. This is because it is necessary to consider that vibration occurs. Here, for example, it is assumed that the maximum allowable count value UCN defines a limit of the upward displacement amount of the cartridge transport body 5, and the minimum allowable count value LCN defines a limit of the downward displacement amount of the cartridge transport body 5.
The loading of the maximum allowable count value UCN and the minimum allowable count value LCN is performed based on, for example, a setting operation of a setting unit (not shown).

As described above, the allowable value over detection circuit 1
4, the count value CN of the pulse count circuit 13
Exceeds the maximum allowable count value UCN, an upward displacement over detection signal AO is applied to one input of the AND circuit 16, and the count value C of the pulse count circuit 13
When N exceeds the minimum allowable count value LCN, the lower displacement over detection signal DO is supplied to one input of the AND circuit 17.

The other input of each of the AND circuits 16 and 17 has a signal from the control unit (not shown) indicating that the cartridge transporter 5 is currently in a stopped state when the cartridge transporter 5 stops at a desired position. Is given. For this reason, the allowable value over detection circuit 14
Outputs an over-displacement over-detection signal AO or a down-displacement over-detection signal DO, the AND condition is satisfied in either one of the AND circuits 16 or 17, and the AND circuit 16 or 17 outputs H to the OR circuit 18. A level signal is output. As a result, the OR circuit 18
Then, an H level power cutoff signal OFF is output to the motor drive circuit 20. When the power cutoff signal OFF signal is input as described above, the motor drive circuit 20 cuts off the power of the servo motor M. Thus, the servo motor M
By shutting off the power supply, the cartridge carrier 5 is fixed at the current position, and as a result, the situation in which the cartridge carrier 5 which should be in a stopped state largely moves in the vertical direction beyond the allowable standard is prevented. It will be.

Next, an example of the operation of this embodiment will be described. For example, when a cartridge used in the drive 4 is transported to the storage cell 2 above the drive 4, the cartridge transporter 5 takes in the cartridge from the drive 4, holds the cartridge, and then, by a servo mechanism, It is raised to the position of the storage cell 2 and stopped exactly at that position. When the cartridge carrier 5 stops at the position of the storage cell 2 as described above, one of the inputs of the AND circuits 16 and 17 is supplied to the cartridge carrier 5 in the abnormal operation prevention device.
Is currently stopped, and the allowable value over detection circuit 14 is loaded with the maximum allowable count value UCN and the minimum allowable count value LCN. Also,
The detection signal generated from the position sensor S from the time when the cartridge carrier 5 stops at the position of the storage cell 2 is supplied to the pulse detection circuit 11 via the waveform shaping circuit 10.
The pulse detection circuit 11 outputs an upper displacement pulse related to the upward displacement of the cartridge carrier 5 in the stopped state and a lower displacement pulse related to the lower displacement of the cartridge carrier 5 in the stopped state from the output signal of the position sensor S. Detecting and detecting the detected upper displacement pulse and lower displacement pulse,
This is given to the pulse count circuit 13 of the abnormal operation detecting section 12. The pulse count circuit 13 counts up and down the upper displacement pulse and the lower displacement pulse, and the current count value CN is given to the allowable value over detection circuit 14.

If the cartridge carrier 5 is displaced in the vertical direction beyond the allowable range in spite of the stop state for sending the cartridge to the storage cell 2,
The count value CN in the pulse count circuit 13 exceeds the maximum allowable count value UCN or falls below the minimum allowable count value LCN. Permissible value over detection circuit 1
4, the count value CN from the pulse count circuit 13
Detects that the maximum allowable count value UCN or the minimum allowable count value LCN that has been loaded first is exceeded, outputs an upper displacement over detection signal AO or a lower displacement over detection signal DO. When the over-displacement over-detection signal AO or the under-displacement over-detection signal DO is output from the allowable value over detection circuit 14, an H level signal is output from one of the AND circuits 16 and 17, and the OR circuit 18 outputs A power-off signal OFF is supplied to the motor drive circuit 20. Then, this power cutoff signal O
The power supply of the servo motor M is cut off by the FF, and as a result, the cartridge carrier 5 to be stopped is fixed at the current position, and the situation in which the cartridge carrier 5 starts moving beyond the allowable range in the vertical direction is reliably prevented. The Rukoto.

When the power of the servo motor M is turned on, the cartridge carrier 5, which must be stopped, may suddenly start moving and run away due to an initial failure of the servo mechanism. The abnormal operation preventing device according to the present invention can be used not only for the abnormal operation of the cartridge carrier 5 when the cartridge is inserted and removed between the storage cell 2, the drive 4 and the like as described above, but also for such a power-on operation. It can also be used to prevent the abnormal operation of the cartridge carrier 5 in the above. In this case, the displacement detection function of the cartridge carrier 5 can be made rougher than in the case of preventing an abnormal operation when the cartridge is taken in and out. However, it can be constituted by an encoder or the like having slits provided at relatively coarse intervals.

The position sensor S is not limited to an incremental encoder, but may be an absolute encoder, or any other sensor capable of detecting the amount of displacement of a cartridge carrier in real time. Good. Further, the present invention is not limited to the abnormal operation of the cartridge transport body in the vertical direction, and can be used for preventing the abnormal operation in the horizontal direction. In addition, the present invention
The present invention is not limited to the LU, and may be implemented in a magnetic tape library device or another recording medium cartridge library device.

[0021]

As described above, according to the present invention, when the transporting member of the recording medium cartridge should be stopped,
Since the operation of the driving means is stopped when the amount of displacement of the cartridge transport exceeds an allowable amount of displacement, it is possible to reliably prevent the recording medium cartridge transport that should be stopped from suddenly starting to move. It has an excellent effect of being able to do so.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a device for preventing an abnormal operation of a recording medium cartridge transporter according to an embodiment of the present invention.

FIG. 2 is a perspective view schematically showing an OLU using the abnormal operation prevention device of FIG.

FIG. 3 is a diagram showing a detection signal output from a position sensor in the OLU shown in FIG. 2;

[Explanation of symbols]

3: storage rack, 4: drive, 5: cartridge carrier, 13: pulse count circuit, 14: allowable value over detection circuit, 20: motor drive circuit, M: servo motor, S: position sensor.

Claims (1)

(57) [Claims] 1. A cartridge storage unit, a cartridge drive for reading or reading / writing a recording medium cartridge, a cartridge transporter movable between the cartridge storage unit and the cartridge drive, and transporting a recording medium cartridge. Driving means for moving the cartridge transporter, wherein the cartridge transporter stops at a predetermined position corresponding to the cartridge storage portion, the cartridge drive, and the like, and stops at the position, the cartridge storage portion, the cartridge drive A recording medium cartridge library device for taking a recording medium cartridge in and out of the cartridge transporting device, wherein a measuring means for measuring a displacement amount of the cartridge transporter; and the cartridge transporter when the cartridge transporter is to be stopped. A designating means for designating an allowable displacement amount, and a detecting means for detecting that the displacement amount measured by the measuring means exceeds the allowable displacement amount when the cartridge carrier is to be stopped. An abnormal operation preventing apparatus for a recording medium cartridge transporter, comprising: a control unit that stops or stops the operation of the driving unit in accordance with the detection of the detection unit.