US 2011/0079953 A1 · DOUBLE FEEDING DETECTION APPARATUS, AUTO SHEET FEEDER AND DOUBLE FEED DETECTION METHOD

Abstract

A double feed detection apparatus includes a first element and a second element at positions where they are opposite to each other across a sheet, and a direction in which an ultrasonic wave or a light passes through the sheet is vertical to a conveyance direction of the sheet. An auto sheet feeder includes the first element and the second element of the double feed detection apparatus in a range from a downstream side of a joining point of an outside conveyance path and an inside conveyance path in the sheet conveyance direction to a near side of a read part.

Claims20

Dependent claims

A double feed detection apparatus comprising:

a control section to generate a control signal;
a transmission signal generation section to generate a transmission signal from the control signal of the control section;
a transmission amplifying section to amplify the transmission signal;
a first element to output the amplified signal to a sheet in a direction perpendicular to a conveyance direction of the sheet;
a second element to receive the signal of the first element passing through the sheet;
a reception amplifying section to amplify the received signal;
and
an A/D converter to convert the received signal as the amplified analog signal into a digital signal and to output it to the control section.

5 more elements

An auto sheet feeder comprising:

a paper feed tray on which documents to be read are placed;
a pickup roller to take out a sheet one by one from the paper feed tray and to deliver it to a conveyance mechanism;
the conveyance mechanism which includes an outside conveyance path and an inside conveyance pat, receives the sheet from the pickup roller and conveys it;
a front surface read section to read a front surface of the sheet;
a rear surface read section to read a rear surface of the sheet;
a storage tray on which the read sheet is stacked;
a control section to generate a control signal;
a transmission signal generation section to generate a transmission signal from the control signal of the control section;
a transmission amplifying section to amplify the transmission signal;
a first element to output the amplified signal to the sheet in a direction perpendicular to a conveyance direction of the sheet;
a second element to receive the signal of the first element passing through the sheet;
a reception amplifying section to amplify the received signal;
and
an A/D converter to convert the received signal as the amplified analog signal into a digital signal and to output it to the control section.

11 more elements

Dependencies are inferred from the claim text.

Facts

Application

12/874,966Filed 2 Sep 2010

Priority

6 Oct 2009

Published

7 Apr 2011

Term ends

Not estimatedThe source records don’t support an estimate.

Classification9 codes

B65H 7/12
Responsive to presence of faulty articles or incorrect separation or feed: responsive to double feed or separation
B65H 2511/524
Defective operating conditions: multiple articles, e.g. double feed
B65H 2515/60
Physical entities not provided for in groups B65H2511/00 or B65H2513/00: optical characteristics, e.g. colour, light
B65H 2515/82
Physical entities not provided for in groups B65H2511/00 or B65H2513/00: sound; Noise

Double feeding detection apparatus, auto sheet feeder and double feed detection method

Life of this patent

Double feeding detection apparatus, auto sheet feeder and double feed detection method

Life of this patent

Abstract

Claims20