JPS55135969A - Character read device - Google Patents
Character read deviceInfo
- Publication number
- JPS55135969A JPS55135969A JP4392079A JP4392079A JPS55135969A JP S55135969 A JPS55135969 A JP S55135969A JP 4392079 A JP4392079 A JP 4392079A JP 4392079 A JP4392079 A JP 4392079A JP S55135969 A JPS55135969 A JP S55135969A
- Authority
- JP
- Japan
- Prior art keywords
- output
- power supply
- circuit
- register
- pulse
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Character Input (AREA)
Abstract
PURPOSE: To make it possible to read a character at a proper position at all times, by calculating with high accuracy the difference between the frequency of commercial input power supply and the reference frequency, and correcting the timing of the read control signal depending on the above difference.
CONSTITUTION: The commercial power supply AC is applied to not only the motor 8 but also the waveform conversion circuit 1 in order to generate a square wave at the output side of the circuit 1, the square wave is provided to a monostable multivibrator 2 in order to generate a pulse signal in the output of the multivibrator 2, and this pulse signal is provided to both the delay circuit 3 and the register 6. The pulse signal which has been passed through the circuit 3 is used for resetting the counter 5, to this counter is provided an output of the oscillator 4 which generates a pulse of frequency higher than that of the power supply AC, and the logical value corresponding to variation of the power supply AC is output to the outputs 20W25. These outputs 20W25 are provided to the register 6, are set by the pulse of the multivibrator 2, the output of the register 6 is provided to the micro-processor 7, compared with the reference value which has been set in advance by the program instruction, and the timing of the read control circuit 9 is corrected depending upon the comparison result.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4392079A JPS55135969A (en) | 1979-04-11 | 1979-04-11 | Character read device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4392079A JPS55135969A (en) | 1979-04-11 | 1979-04-11 | Character read device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS55135969A true JPS55135969A (en) | 1980-10-23 |
Family
ID=12677141
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4392079A Pending JPS55135969A (en) | 1979-04-11 | 1979-04-11 | Character read device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55135969A (en) |
-
1979
- 1979-04-11 JP JP4392079A patent/JPS55135969A/en active Pending
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