Paper width detector

Abstract

The paper width detector includes at least one paper guiding plate, one conducting assembly, one circuit board and one circuit processing unit. The paper guiding plate capable of moving is set on the paper feeding box to hold paper; the conducting assembly has several conductor parts; the circuit board has several lines of wires to form several second separated conducting parts with insulating area in between; and the controlling and processing unit provides one voltage across the wires and the conducting assembly. In case of jamming paper, the first conducting part and the second conducting part contact electrically corresponding the insulating area, and the controlling and processing unit forms one digital signal based on the passage formed between the first conducting part and corresponding wires to generate one paper width value.

Description

technical field [0001] The present invention relates to a paper width detection device on a document feeder, and in particular to a paper width detection device capable of detecting non-standard paper width. Background technique [0002] Please refer to FIG. 1 , which shows a partial top view of a conventional automatic document feeder (ADF). In FIG. 1, the automatic document feeder 10 includes a paper feeder 12, a guide 13 and sensing components 14a, 14b, and 14c. The guide 13 is fixed on the paper feeder 12 for allowing the paper to One end is closely leaning against, and papers 15a, 15b and 15c are used for illustration here. The sensing components 14a-14c are spaced apart from each other and arranged on the paper tray 12 for correspondingly sensing the width of the papers 15a-15c. When the paper 15a covers the sensing unit 14a, the sensing unit 14a will detect the paper 15a, and the automatic document feeder 10 presets the width of the paper 15a to be, for example, the...

AI Technical Summary

Problems solved by technology

[0003] It should be noted that the traditional design of using multiple sensing components to detect the width of paper can only be limited to a few standard paper such as A5, A4 and B4, and cannot detect the width of non-standard paper

Moreover, if more papers of different widths are to be detected, more sensing components must be installed on the ADF, and the judging mechanism of the paper width inside the ADF will be more complicated

In this way, a lot of cost will be increased

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