JPS6336526Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Technical field of the invention The invention relates to the control of a picker provided in an access mechanism used in a mass storage device, and in particular, the invention relates to the control of a picker provided in an access mechanism used in a mass storage device. The present invention relates to a sensor detection circuit that detects the state of the picker using a sensor.

(b) Background of the technology In large-capacity storage devices used in information processing devices, data cartridges are stored in multiple shelf-like cells, and a given data cartridge is taken out by an access mechanism and transferred to an entry station mechanism. Injected. The input data cartridge is subjected to recording and reproduction processing by a recording/reproducing mechanism, and after the processing is ejected to an exit station mechanism. The ejected data cartridge is transported and stored again by the access mechanism to the original location from which it was taken out.

Such a mass storage device is schematically constructed as shown in the perspective view of FIG. 1 and the sectional view of FIG. 2.

A large number of cells 2 having a hexagonal cross section have a cell assembly 3 formed in a honeycomb shape, and each cell 2 has one bullet-shaped data cartridge 5 in which a magnetic recording tape is wound in a film shape. It is stored.

An inlet 6 and an outlet 7 are installed in the cell assembly 3, and an entry station mechanism 30 is installed between the inlet 6 and the outlet 7 as shown in FIG.
A recording/reproducing mechanism 40, a shoot mechanism 50, and an exit station mechanism 60 are provided.

An access mechanism 22 is provided at a position facing the cell assembly 3, and the access mechanism 22 has a support base 25 supported slidably in the directions of arrows A and B along a guide shaft 23. . A motor 28 is provided on the support base 25.
8 can move the support stand 25 horizontally in the directions of arrows A and B as appropriate. A picker 27 is provided on the support stand 25 so as to be movable by a motor 29 in a direction perpendicular to the directions of arrows A and B, that is, in the directions of arrows C and D. The picker 27 moves the data cartridge 5 into the cell 2. It can be stored in the cell 2 or taken out from the cell 2.

Therefore, when recording or reproducing predetermined information in the data cartridge 5, as shown in FIG. At the same time, the motor 29 moves the picker 27 in the C and D directions, which are perpendicular to the A and B directions, and the picker 27 and the data cartridge 5 on which target information is to be recorded or reproduced are moved.
The stored cell 2 is matched with the stored cell 2. Pitsuka 27
When the data cartridge 5 and the cell 2 are aligned, take out the data cartridge 5 from the cell 2, move the support stand 25 and the picker 27 again in the A, B direction, and the C, D direction to align the picker 27 and the input slot 6. , the picker 27 inserts the data cartridge 5 taken out from the cell 2 into the input slot 6. The inserted data cartridge 5 is sent to the recording/reproducing mechanism 40 via the entry station mechanism 30, as shown in FIG. 2, and predetermined information is read from or written to the data cartridge 5. The data cartridge 5 on which recording or reproduction has been completed in this manner is ejected to the shoot mechanism 50. The ejected data cartridge 5 is guided by a guide slope 51 and ejected to the exit station mechanism 7.

The ejected data cartridge 5 is placed in the picker 27.
It is retrieved by Thereafter, in the same manner as described above, the support stand 25 and the picker 27 move appropriately in the directions A, B, and C, D, and the data cartridge 5 is transferred to the cell 2 where it was previously stored and stored therein.

(c) Prior Art and Problems Such a picker 27 is constructed as shown in the perspective view of FIG. 3. A movable portion 27C is provided which is locked to two rails 27B stretched by a frame 27A and slid in the direction of arrow G.

A magnet 27D that attracts the data cartridge 5 is fixed to the movable portion 27C. Fixed plates 27E and 27F are fixed to both sides of this movable part 27C, and one fixed plate 27E has a plurality of light emitting elements.
L ₁ , L ₂ , and L ₃ are fixed, and light receiving elements F ₁ , F ₂ , and F ₃ are fixed to the other fixed plate 27F so as to face the respective light emitting elements L ₁ , L ₂ , and L ₃ . It is configured.

These light emitting elements L ₁ , L ₂ , L ₃ and light receiving element F ₁ ,
The photo sensor formed by F ₂ and F ₃ detects the movement of the movable portion 27C, and the aforementioned data cartridge 5 is taken out and stored.

This photo sensor is operated by a sensor detection circuit shown in FIG. FIG. 4 is a circuit diagram of a conventional sensor detection circuit.

In response to a command from the sampling circuit I, the drive circuit H reduces the number of light emitting elements L ₁ to L ₃ . Photodetector S ₁ ~ _{S 2}
The movable portion 27C is held between the movable portions 27C as described above, and outputs a signal by point reduction to the receiving circuit J while facing the light emitting elements _L1 to _L3 , respectively. Furthermore, upon receiving this signal, the receiving circuit J outputs a sensor signal, which is stored in the storage section M. The storage unit M is configured to send the stored sensor signal as a detection signal to the control unit CON. This sampling period generating circuit I performs sampling at minute periods and is used coaxially with other signal cables to reduce the number of cables used as much as possible and to reduce the transfer load on the access mechanism 22 mentioned above. has been done.

However, the detection signal sent out in this manner has the disadvantage that it receives noise from other signals and sends out an erroneous detection signal.

If such an erroneous detection signal is output, for example, if the data cartridge 5 is erroneously detected as being held in the picker 27 when it is not, the control unit CON will not be able to proceed to the subsequent operation. However, there was a problem that the operation of the device stopped.

(d) Purpose of the invention The purpose of the invention is to provide a device that eliminates the above-mentioned problems by preventing false detection signals from being sent even if they are generated due to noise or the like. be.

(e) Structure of the invention The purpose of the invention is to detect the position of the movable part of the picker that moves back and forth with respect to the designated cell and takes the data cartridge in and out of the designated cell after the picker accesses the designated cell. , a light-emitting element and a light-receiving element facing each other with the movable part in between, a drive circuit that blinks the light-emitting element, a receiving circuit that receives a signal from the light-receiving element and outputs a detection signal, and a drive circuit that moves back and forth. and a sampling period generation circuit that commands sampling at a predetermined period shorter than the time of a first storage section that stores the detection signal as a detection signal; a second storage section that stores the detection signal in the current sampling cycle as a second detection signal;
a comparison circuit that compares the first and second detection signals and outputs a match signal or a mismatch signal; and a third storage section that stores the first detection signal as a third detection signal based on the match signal. The first detection signal is set by the coincidence signal, and the third detection signal stored in the previous sampling cycle is set by the mismatch signal as a detection signal in the current sampling cycle. This is achieved by a sensor detection circuit characterized by comprising: a multiplexer for outputting to a control section;

(f) Example of implementation of the idea The present invention will be explained in detail below with reference to FIG.

FIG. 5 is a circuit diagram showing an embodiment of the sensor detection circuit according to the present invention.

The previous sensor signal output from the receiving circuit J is stored in the first storage section _M1 , the next sensor signal is stored in the second storage section _M2 , and the next sensor signal is stored in the second storage section _M2. , M ₂ and the comparison circuit K
Compare by. If the stored detection signals match based on the comparison result, the first storage unit
The detection signal stored in _M1 is sent to and stored in the third storage unit _M3 , and is also sent as a detection signal to the control unit CON via the multiplexer P. If the comparison results do not match, the third storage unit
The detection signal stored in _M3 is sent out via multiplexer P.

With such a circuit configuration, the detection signal can be output as shown in the explanatory diagram of FIG. 6, for example.

FIG. 6 shows the detection signal j ₁ output from the receiving circuit I and the detection signal stored in the first storage unit M ₁ at sampling times t ₁ , t ₂ to _{t 20} instructed by the sampling period generating circuit I. j ₂ , second storage unit M ₂
The relationship between the detection signal j ₃ stored in the comparator circuit K, the match/mismatch signal k of the comparator circuit K, the detection signal j ₄ stored in the third storage unit M ₃ and the detection signal j ₅ output from the multiplexer P is shown. It is something.

“0” of the detection signal j ₁ detected at the sampling period t ₁ is stored as the detection signal j ₂ .

When "0" of the detection signal j ₁ detected by the next sampling period t ₂ is output, "0" of the previous detection signal j ₃ outputs "0" as the detection signal j ₂ ,
The next detection signal _j1 of "0" is stored. Therefore,
Detection signals j ₂ and j ₃ are compared, and the matching signal k is “1”.
is output, "0" of the detection signal j ₂ is sent and stored as the detection signal j ₄ , and "0" is output as the detection signal j ₅ .

If the detection signal j ₁ becomes "1" due to the detection as shown in the sampling period t ₅ , "1" is stored in the detection signal j ₃ , and the comparison between the detection signals j ₂ and j ₃ is A mismatch signal k of "0" is output.

In this case, the detection signal _j2 of “0” is not sent,
“0” of the previously stored detection signal j ₄ is the detection signal
Output as j ₅ . Next sampling period t ₆
Even in this case, "0" of the mismatch signal k is outputted between the detection signals j ₂ and j ₃ , and therefore "0" from the detection signal j ₄ is outputted as the detection signal j ₅ .

Detection signal j ₁ is “1” after sampling period t ₉
In this case, at the first time t ₉ , the detection signal j ₅ is “0” as in the case of false detection described above.
However, since the detection signal j ₁ is detected as "1" even in the sampling period t ₁₀ , the detection signal j ₅ is output as "1" due to "1" of the coincidence signal k.

Even in this case, even if the detection signal j ₁ detects "0" due to erroneous detection as shown in the sampling period t ₁₄ , the detection signal j ₅ is output as "1" as described above.

Therefore, even if an erroneous detection signal is output due to noise or the like, it can be determined by comparing the first and second storage units M ₁ and M ₂ , so that a detection signal due to erroneous detection will not be sent out. First, the detection signals stored in the third storage unit _M3 that are matched by comparison are output.

In this way, instantaneously detected false positive signals of the sampling period t ₁ t ₂ . . . can be corrected.

(g) Effect of the invention As explained above, the invention provides a comparison method in which the first storage section _M1 that stores the previous detection signal and the second storage section _M2 that stores the next detection signal are respectively compared. The circuit K is further provided with a third storage section M3 in which the detection signal stored in the first storage section _M1 is stored when it matches that of the second storage section _M2 , and a third storage section _M3 is provided to store the detection signal when the detection signal stored in the first storage section M1 matches that of the second storage section M2. This is to prevent false detection signals from being output. This prevents the control of the access mechanism from being stopped due to noise as described above, and has a great practical effect.

[Brief explanation of the drawing]

FIG. 1 is a perspective view schematically showing a mass storage device;
Figure 2 is a sectional view, Figure 3 is a perspective view of Pitzka, Figure 4
5 is a circuit diagram of a conventional sensor detection circuit, FIG. 5 is a circuit diagram of an embodiment of the sensor detection circuit according to the present invention, and FIG. 6 is an explanatory diagram of a detection signal in a sampling period. In the figure, L ₁ , L ₂ , L ₃ are light emitting elements, S ₁ ,
S ₂ , S ₃ are light receiving elements, H is a driving circuit, J is a receiving circuit, I is a sampling period generating circuit, M ₁ , M ₂ ,
M ₃ and M are storage units, K is a comparison circuit, P is a multiplexer, and CON is a control unit.

Claims (1)

[Scope of Claim for Utility Model Registration] After the picker accesses a designated cell, the movable part of the picker that moves back and forth with respect to the designated cell and takes the data cartridge in and out of the designated cell is detected. A light-emitting element and a light-receiving element that face each other with a light-emitting element and a light-receiving element facing each other, a drive circuit that blinks the light-emitting element, a receiving circuit that receives a signal from the light-receiving element and outputs a detection signal, and a time shorter than the time for the forward and backward movement of the drive circuit. A sensor detection circuit comprising a sampling cycle generation circuit that commands sampling at a predetermined cycle, and outputs a detection signal from the receiving circuit in response to the command, the detection signal in the previous sampling cycle being stored as a first detection signal. a first storage section that stores the detection signal in the current sampling period as a second detection signal; and a second storage section that stores the detection signal in the current sampling period as a second detection signal; a third storage section that stores the first detection signal as a third detection signal according to the coincidence signal; and a third storage section that stores the first detection signal as a third detection signal according to the coincidence signal; A multiplexer that outputs the third detection signal stored in the previous sampling period due to the mismatch signal to the control unit as a detection signal in the current sampling period, respectively. Sensor detection circuit.