Printer

Abstract

Abstract PURPOSE:To control the printing pressure of a printing head at a constant value, and to print a character distinctly by detecting the printing pressure of the printing head and shortening the application time to the printing head when the printing pressure is made higher than a specified printing pressure and lengthening the application time to the printing head when the printing pressure is made lower than the specified printing pressure. CONSTITUTION:A main control section moves a printing head 4a to a photodetector 13c in order to detect the printing pressure of the head pin of the printing head 4a. The printing head 4a is moved, the main control section outputs a drive signal to a driver circuit, and the head pin of the printing head 4a is struck against a pressure detecting element 6 mounted to a printing base 4b. When the head pin is struck, the pressure detecting element 6 converts pressure into voltage and outputs it to an amplifier circuit. Output voltage is converted into a digital signal, and the printing pressure of the head pin is checked. When the value of the digital value is brought to a reference value or less, the main control section lengthens the application time to the head pin of the printing head 4a. When the peak value of the digital signal input is brought to the reference value or more and to a value exceeding a tolerance, the main control section 18 shortens the application time, and keeps printing density constant.

Inventors

• 👤 Ichiro Nakamura
• 👤 伊知郎 中村
• 👤 Yukima Taniguchi
• 👤 谷口　雪磨
• 👤 Isahito Kasamatsu
• 👤 笠松　功仁

Bibliographic Details