Ink jet printer
AssigneeBrother Kogyo Kabushiki Kaisha
InventorKoji Imai
Life of this patent
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Abstract
Disclosed is an ink jet printer in which the temperature detecting circuit 8 is arranged between the thermistor 3 mounted on the ink jet head 2 and the flexible cable 7 for transmitting the signal output from the thermistor 3 to the CPU 30, and the analog signal, which is the voltage value corresponding to the temperature of the ink jet head 2, from the thermistor 3 is converted into the pulse signal (digital signal) by the temperature detecting circuit 8, the digital signal being output to the CPU 30 through the flexible cable 7, thereby the drive voltage of the ink jet head 2 is controlled according to the viscosity change of the ink occurring by the temperature change of the ink jet head 2 itself or the circumstance surrounding the ink jet head 2, by detecting the temperature of the ink jet head 2 through the thermistor 3.
Claims13
An ink jet printer having a carriage, an ink jet head installed on the carriage, a thermistor for detecting temperature of the ink head and a controller for controlling a drive voltage to drive the ink jet head, the ink jet printer further comprising:
- a flexible cable for connecting the thermistor arranged at the carriage side and the controller;
- and
- a temperature determining device connected between the thermistor and the flexible cable for converting an analog voltage value output from the thermistor into a digital signal before an analog data of the analog voltage value is transmitted to the flexible cable, thereafter the digital signal being transmitted to the controller through the flexible cable, the temperature determining device having at least a predetermined value set therein
- corresponding to a predetermined temperature, the temperature determining device judging whether the analog voltage value representing the temperature of the ink jet head exceeds the predetermined value, the temperature determining device outputting a pulse signal with one polarity when judged that the analog voltage value is less than the predetermined value and outputting the pulse signal with the opposite polarity when judged that the analog voltage value exceeds the predetermined value.
The ink jet printer according to 8, wherein the controller controls the ink jet head based on a 30V drive voltage according to the plus pulse signal and controls the ink jet head based on a drive voltage lower than 30V according to the minus pulse signal.
Dependencies are inferred from the claim text.