Printing machine paper feed counting sensor device

Abstract

The invention discloses a paper skip counting and sensing device of a printer. The paper skip counting and sensing device comprises a counting pulse generating unit, a narrow pulse filter unit and a paper skip speed transformation unit, wherein the counting pulse generating unit is used for generating initial counting pulses for paper skip counting; the narrow pulse filter unit comprises a controllable charge circuit, a controllable discharge circuit, a capacitor and a Schmidt circuit; output counting pulses are used for controlling the controllable charge circuit and the controllable discharge circuit through a three-state gate, wherein for one circuit, the capacitor is charged or discharged by the initial counting pulses, and a signal on the capacitor passes through the Schmidt circuit to obtain counting pulses. The device can automatically filter interferences of continuous positive narrow pulses and continuous negative narrow pulses; the maximum width of the to-be-filtered positive narrow pulses and to-be-filtered negative narrow pulses can change along with the changes of paper skip speed, and can be separately regulated by changing a charging time constant and a discharge time constant. The device can be applied to occasions, in which paper skip quantity is needed to be counted, on various printers.

Description

technical field [0001] The invention relates to a detection device, in particular to a paper-feeding counting sensor device for a printing machine. Background technique [0002] During the printing process of the printing machine, it is necessary to count the number of sheets fed by the printing machine. Counting the number of paper feeds often uses photoelectric switches, Hall switches, magnetic reed switches, or inductive proximity switches, capacitive proximity switches and other detection devices to detect the paper feeding process. When the paper moves, the detection device generates an initial counting pulse signal, and various counting devices count the number of papers. Due to the shaking during the paper feeding process, the shaking of the paper feeding transmission mechanism, and the shaking of the contacts of the mechanical switch itself, the edge of the initial count pulse signal generated by the detection device has a jitter pulse, that is, a narrow pulse inter...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems existing in the initial pulse signal of the number of paper feeds in existing printing machines, the present invention provides a paper feed counting sensor device for a printing machine, which includes a counting pulse generating unit and a narrow pulse filtering unit

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