JPS58130471A - Control system for positioning of head - Google Patents

Abstract

PURPOSE:To reduce seek time by storing the seek quantity for setting a head position, setting the settling time which is optimum for the seek quantity, and starting reading-out and writing upon lapse of the settling time. CONSTITUTION:The pulses to be delivered to a stepping motor necessary for seeking are set in an up-down counter 1. At the same time, the same are inputted to an FF4 and a timer counter 3 to reset both and to disable the counting with the counter 3. According to the number of pulses, the count corresponding to the optimum settling time for the seek length stored in an ROM2 is inputted in the counter 3. When the setting of the pulses ends, the driving of a motor is started by a START signal and the counter 1 counts down and when the counter counts zero, the same sends a signal BR which sets the FF4 to enable counting with the counter 3, then the counter begins to count the numerical value delivered by the ROM2. The operation of reading and writing is started by the output signal delivered when the counting ends.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field of the Invention The invention relates to an operation of positioning the head of a magnetic recording/reproducing device such as a magnetic recording/reproducing device, which is called seek, to a position necessary for data reading/consolidation. This invention relates to improvements in head positioning control methods in.

(b) Conventional technology and the conventional seek method using a Stella Pink motor to set the head to 4
Isokki trowel recycled rattan cloth using the method of resembling 1.

Settling time is the time from when the head reaches the position pressure of the track to when read/V input operations are possible, and is the settling time of the seek length that maximizes the time it takes for the head vibration to subside.・When the head moves by 0 seek, which is the same as the time, it swings 1IllllI at the stop position.
However, the duration of imaging varies depending on the size of the transfer device, that is, the seek length, and the longest time is when the head is stopped midway through acceleration.

Therefore, even though the vibration of the head has subsided for most of the seek nose, it is necessary to wait for intermittent processing until a certain settling time has elapsed. It has the disadvantage of reducing stray electricity and further reducing the performance of the information processing system.

(The purpose of C1 is to eliminate the above drawbacks by changing the settling time depending on the seek length and eliminating unnecessary waiting time.
- Improving the processing speed of magnetic recording and reproducing devices and increasing the capabilities of information processing systems.

(d) Structure of the Invention When seeking, the number of pulses to be sent to the stepping motor is known in advance, and the duration of vibration of the head is determined by the seek length, which varies depending on the mechanical performance of the seek mechanism. Based on this knowledge, the settling time is controlled by the number of pulses sent to the stepping motor. That is, there is an up/down counter that counts and stores the number of pulses sent to the stepping motor, and a ROM that calculates the seek length from the output of the counter and sends out the minimum settling time most suitable for the seek length as a numerical value. , stepper motor III
When the sending of the pulse that moves is completed, a timer counter is set to start counting the a value sent by the ROM, and the read/enrichment operation is started with the output sent when the counting of the timer counter is completed. That's 17 times.

tel　Embodiments of the invention FIG. 1 is a circuit diagram showing an embodiment of the present invention.

FIG. 2 is a time chart for explaining the operation of FIG. 1. In order to seek in FIG. 1, the step pulse to be sent to the stepping motor enters the 5TEP terminal as shown in FIG.
The step pulse input to the P terminal allows the up/down counter '1 to complete the addition. 7 lip flops 4F at the same time
The timer counter 3 at the iR8 terminal is reset by the step pulse that enters the CLR terminal, and the 7 flip-flop 4
The output A of the Q terminal of the timer counter 3 and the output SKC of the timer counter 3 are reset by the preceding pulse of the step pulse as shown in FIG. 2A and SKC. Counting operation becomes disabled with a reset signal.

ROM2, which stores settling time that changes depending on the seek length, is connected to the output terminal Q of up/down counter 1.
1. Based on the count values sent to Q2 to Qn, a pre-stored number representing the seven link times is sent to the input terminals Ll, L2 to Ln of the timer counter 3.
When the input of the start pulse indicated by TEP is completed, 5T
Introducing the stepping motor shown in Figure 2, DRIVE, where the seek start pulse enters from the 5TART terminal, enters the LD terminal of timer counter 3, and the output of ROM2 is stored in timer counter 3#/c. The step drive pulse to 1 is sent from the DRIVE terminal to D of uptown counter 1.
When it enters the N terminal, the up/down counter 1 does not subtract, and when it becomes negative, the @ symbol is sent from the BR terminal to the CL terminal of the flip-flop 7 and the flip-flop 4 is set to l. As shown in Figure 2A, the output A of the flip roller 14 sets the timer counter 30ENl terminal with the last pulse of the step drive pulse DRIVE, and the timer counter 3 is not enabled for counting operation, but is the output of the ROM 2 already stored. ◎When the counting is completed, timer counter 3
A terminal to J) SKC terminal as shown in Figure 2 SKC (SK
Send the C signal ◎ SKC signal is inverted by the NOT circuit 5 and enters the EN2 terminal of the timer counter 3 to stop the counting operation of the timer counter 3. The time is the optimum settling time for the seek length that can be stored in the ROM2.

g) In the magnetic recording re-coupling filK that produces the effect of the invention / performs 4-inclusion,
Although the time required for head vibrations caused by head movement to subside varies depending on the seek length, it is possible to obtain an optimal settling time that is commensurate with this variation value, thereby improving the processing speed of the magnetic recording and reproducing device. Able to improve the ability of information processing systems0

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing an embodiment of the invention, and FIG. 2 is a time chart for explaining the operation of FIG. I Fi7 y down counter, 2iltROM,
3i/'i tie I counter, 4 is flip-flock,
5 is NOT1g circuit〇

Claims (1)

[Claims] The counting means includes means for storing the amount of movement for determining the position of the head, means for transmitting a predetermined numerical value based on the stored contents of the storage means, and means for starting counting the numerical value from a predetermined time. A head positioning control system that starts reading/setting operations based on output◎