Paper multi-feed detection apparatus and paper multi-feed detection method

Inactive Publication Date: 2008-08-28
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0022]According to the present invention, a stable transmission capability is guaranteed because a noise component is avoided from being generated at the time of the ultrasonic wave transmission, and a receiving capability can be improved by properly blocking a noise

Problems solved by technology

Such a noise component may deteriorate the capability of the sensor and thus cause erroneous detection of the paper sheet 41.
However, merely setting the transmitting direction of the ultrasonic wave to be oblique is not sufficient to obtain a sufficient sensor capability.
Such a noise component is likely to have an adverse influence on the performance of the paper mult

Method used

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  • Paper multi-feed detection apparatus and paper multi-feed detection method
  • Paper multi-feed detection apparatus and paper multi-feed detection method
  • Paper multi-feed detection apparatus and paper multi-feed detection method

Examples

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Example

Embodiment 1

[0039]Hereinafter, one embodiment of the present invention will be described with reference to the figures.

[0040]The figures show a paper sheet multi-feed detection apparatus which maybe built in a copier. As shown in FIG. 1, a paper sheet multi-feed detection apparatus 11 includes a main body 12 and a feeding path 13, provided above the main body 12, for feeding a paper sheet P in a horizontal direction two-dimensionally. A top surface of the feeding path 13 is covered with an upper feeding guide plate 14, and a bottom surface of the feeding path 13 is covered with a lower feeding guide plate 15. The upper feeding guide plate 14 and the lower feeding guide plate 15 face each other while having a two-dimensional feeding space 13a therebetween.

[0041]A transmitter 17 of an ultrasonic sensor 16 is provided above the feeding path 13, and a receiver 18 of the ultrasonic sensor 16 is provided below the feeding path 13. The transmitter 17 and the receiver 18 also face each othe...

Example

Embodiment 2

[0052]FIG. 3 shows another paper multi-feed detection apparatus 31. The paper sheet multi-feed detection apparatus 31 includes a main body 32 and a feeding path 33, provided above the main body 32, for feeding a paper sheet P in a horizontal direction two-dimensionally. A top surface of the feeding path 33 is covered with an upper feeding guide plate 34, and a bottom surface of the feeding path 33 is covered with a lower feeding guide plate 35. The upper feeding guide plate 34 and the lower feeding guide plate 35 face each other while having a two-dimensional feeding space 33a therebetween.

[0053]A transmitter 37 of an ultrasonic sensor 36 is provided above the feeding path 33, and a receiver 38 of the ultrasonic sensor 36 is provided below the feeding path 33. The transmitter 37 and the receiver 38 also face each other while having the feeding path 33 therebetween. Transmitting and receiving directions of the ultrasonic sensor 36 are set to be oblique with respect to the...

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Abstract

A paper multi-feed detection apparatus and a paper multi-feed detection method are provided for preventing the detection capability from being deteriorated by a noise factor and improving the detection precision even where an area around the feeding path has no extra space in terms of the shape and there are many noise-generating factors because of a demand for a smaller size of the device. An ultrasonic transmission opening formed in one of two feeding guide plates is large so as to discharge outside a reflected wave which returns through the ultrasonic transmission opening, and an ultrasonic receiving opening formed in the other feeding guide plate is smaller than a receiving face area of a receiver for receiving the ultrasonic wave.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a paper multi-feed detection apparatus applicable to office equipment such as, for example, copiers and scanners, and more specifically to a paper multi-feed detection apparatus and a paper multi-feed detection method for accurately detecting that sheets of paper such as blank or printed forms, banknotes, gift certificates, book coupons, checks, cards and the like are fed in an overlapped state.[0003]2. Description of the Prior Art[0004]Recently, as an apparatus for detecting multi-feed of sheets of paper which easily tend to be fed in an overlapped state, for example, sheets of thin paper or the like, a paper multi-feed detection apparatus using an ultrasonic sensor is known. When such an ultrasonic sensor is used to detect sheets of paper, the following detection capabilities unique to the ultrasonic sensor are provided.[0005](1) Since detection is performed without any contact with th...

Claims

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Application Information

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IPC IPC(8): B65H7/12
CPCB65H7/12B65H2404/611B65H2511/524B65H2515/82B65H2553/30B65H2220/01B65H2220/03B65H2701/1912
Inventor CHUJO, HIDEKINAKAMURA, HITOSHIYABUTA, JUNKOMIYOSHI, FUMINORIATSUMI, HIDETOSHINAKAZAWA, SHINJI
Owner SHARP KK
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