Formfeed encode feedback circuit

Abstract

The invention relates to a formfeed coding feedback circuit. A first simulating signal and a second simulating signal which are detected and output by a light sensor are received. The formfeed coding feedback circuit comprises: a digital control circuit for generating a plurality of digital counting signals; a comparison circuit used for comparing the first simulating signal and the second simulating signal respectively with corresponding a third simulating signal and a fourth simulating signal. When compared results are not same, the digital control circuit generates a second digital counting signal to be transferred to a digital simulating conversion circuit for the subsequent comparison. When the compared results are the same, the digital control circuit obtains the position and the moving distance of an optical scale according to the corresponding signal counting signal.

Description

technical field [0001] The invention relates to a paper feed code feedback circuit, in particular to a paper feed code feedback circuit suitable for an inkjet printing system. Background technique [0002] In addition to laser printers, inkjet printers are another widely used type of printers currently on the market. They have the advantages of low price, easy operation, and low noise, and can print on various types of paper, such as paper and photo paper. Inkjet media. [0003] Inkjet printers are equipped with an automatic paper feeder, which is mainly used to send paper to the inside of the printer for printing processing. However, the paper feeding accuracy of the automatic paper feeder is closely related to the print quality, and is generally obtained by detecting the signal of the optical ruler. Know the current position of the paper feed motor used to transport the paper and the number of paper feed steps to control the accuracy of the paper feed, and send the paper ...

AI Technical Summary

Problems solved by technology

[0007] The main purpose of the present invention is to provide a paper feeding code feedback circuit, which generates a digital counting signal through a digital control circuit and inputs it to a digital-to-analog conversion circuit to convert it into an analog signal and transmit it to a comparison circuit, so that the comparison circuit converts the digital The analog signal output by the analog conversion circuit is compared with the analog signal fed back by the optical scale. When the output of the comparator is a high potential signal, the digital control circuit can know the current paper feeding position and the number of steps to solve the problem of the traditional paper feeding coding circuit. The resolution of paper feeding cannot meet the current demand for high-precision paper feeding, and the analog-to-digital converter used in the known paper-feed encoding circuit is expensive, which will increase the production cost of the printer, and it is easy to be affected by the conversion time of the analog-to-digital converter. Errors and other disadvantages caused by the delay on the

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