CONVEYING DEVICE

• US 20140239584A1
• Filed: 02/20/2014
• Published: 08/28/2014
• Est. Priority Date: 02/27/2013
• Status: Active Grant

• Current Assignee: RISO Kagaku Corporation
• Original Assignee: RISO Kagaku Corporation
• Inventors: HORI, Eiji
• Granted Patent: US 8,888,094 B2
• Time in Patent Office: Days
• US Class Current: 271/265.04
• CPC Class Codes: B65H 2220/01 indicating an entity as a function of which control, adjustment or change is performed, i.e. input
• CPC Class Codes: B65H 2220/02 indicating an entity which is controlled, adjusted or changed by a control process, i.e. output
• CPC Class Codes: B65H 2220/03 indicating an entity which is measured, estimated, evaluated, calculated or determined but which does not constitute an entity which is adjusted or changed by the control process per se
• CPC Class Codes: B65H 2301/44735 suction belt
• CPC Class Codes: B65H 2301/4474 Pair of cooperating moving elements as rollers, belts forming nip into which material is transported
• CPC Class Codes: B65H 2301/51212 perpendicularly to the direction of displacement of handled material, e.g. forming a loop
• CPC Class Codes: B65H 2511/22 Distance
• CPC Class Codes: B65H 2511/524 Multiple articles, e.g. double feed
• CPC Class Codes: B65H 2515/60 Optical characteristics, e.g. colour, light
• CPC Class Codes: B65H 2553/412 in barrier arrangements, i.e. emitter facing a receptor element
• CPC Class Codes: B65H 2553/51 Encoders, e.g. linear
• CPC Class Codes: B65H 2557/23 Recording or storing data
• CPC Class Codes: B65H 2557/2423 involving an average value
• CPC Class Codes: B65H 7/125 sensing the double feed or separation without contacting the articles
• CPC Class Codes: B65H 9/006 the stop being formed by forwarding means in stand-by

Abstract

There is provided a conveying device including a controller that makes a conveying speed of a printing medium conveyed by a first conveyor unit be higher than a conveying speed of a printing medium conveyed by a second conveyor unit and makes the printing medium be conveyed while forming sagging on the printing medium between the first and second conveyor units. The controller makes a sheet sensor acquire the amount of light, which passes through the printing medium conveyed between a light emitting part and a light receiving part, as the amount of received light and determines whether or not the double-feed of the printing media has occurred only when this amount of received light is smaller than the double-feed criterion amount of received light at substantially the same conveying distance of the printing medium conveyed by the first conveyor unit.

Claims

1. A conveying device comprising:

a first conveyor unit that conveys a printing medium;

a second conveyor unit that is disposed on a conveying path on a downstream side of the first conveyor unit and conveys the printing medium;

a medium detecting unit that is disposed between the first and second conveyor units, including a light emitting part emitting light to the conveying path and a light receiving part disposed so as to face the light emitting part with the conveying path interposed therebetween and receives the light emitted from the light emitting part, and acquires an amount of light, which passes through the printing medium conveyed along the conveying path and is received by the light receiving part, as an amount of received light;

a storage unit that stores a double-feed criterion amount of received light created on a basis of the amount of received light acquired by the medium detecting unit; and

a controller that makes a conveying speed of the printing medium conveyed by the first conveyor unit higher than a conveying speed of the printing medium conveyed by the second conveyor unit, and makes the printing medium to be conveyed while forming a sag on the printing medium between the first and second conveyor units,

wherein the controller makes the medium detecting unit acquire the amount of received light according to a conveying distance of the printing medium conveyed along the conveying path, and determines that the double-feed of the printing media has occurred when the amount of received light is smaller than the double-feed criterion amount of received light at substantially the same conveying distance of the printing medium and a difference therebetween is equal to or larger than a predetermined threshold.

2. The conveying device according to claim 1,

wherein the amount of received light and the double-feed criterion amount of received light are obtained by the averaging of a plurality of amounts of received light acquired by the medium detecting unit for each of predetermined conveying distance of the printing medium.

3. The conveying device according to claim 1,

wherein the controller determines that the double-feed of the printing media has occurred when the amount of received light acquired by the medium detecting unit is smaller than the double-feed criterion amount of received light at substantially the same conveying distance of the printing medium and cases in which a difference therebetween is equal to or larger than a predetermined threshold successively occur a predetermined number of times.