Document conveying apparatus, determination method, and computer-readable, non-transitory medium

• US 10,196,222 B2
• Filed: 06/06/2016
• Issued: 02/05/2019
• Est. Priority Date: 11/18/2015
• Status: Active Grant

• Current Assignee: PFU Limited (Fujitsu Limited)
• Original Assignee: PFU Limited (Fujitsu Limited)
• Inventors: Sakai, Masaaki
• Primary Examiner(s): Morrison, Thomas A
• Application Number:
  US15/174,893
• Publication Number:
  US 20170137245A1
• Time in Patent Office: 974 Days
• Field of Search: 27125801, 27126501
• 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 2220/03 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 2511/52 Defective operating conditions
• 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 5/06 by rollers or balls, e.g. between rollers transport by suction rollers B65H5/226
• CPC Class Codes: B65H 7/14 by photoelectric feelers or detectors
• CPC Class Codes: G01D 5/3473 Circular or rotary encoders
• CPC Class Codes: H03K 5/08 by limiting; by thresholding; by slicing, i.e. combined limiting and thresholding H03K5/07 takes precedence; comparing one pulse with another H03K5/22; providing a determined threshold for switching H03K17/30
• CPC Class Codes: H03K 5/1252 Suppression or limitation of noise or interference specially adapted for transmission systems H04B15/00, H04L25/08

Abstract

A document conveying apparatus includes a light source, a disk including a plurality of slits spaced apart with a predetermined interval in a rotation direction of the disk, which rotates in the rotation direction with a rotation speed as a document is conveyed, a light reception element provided at a position facing the light source with the disk interposed therebetween, a first signal generator for generating a first signal in accordance with light received by the light reception element, a second signal generator for generating a second signal obtained by removing, from the first signal, a noise component according to the rotation speed of the disk, and a controller for determining whether a document is conveyed by comparing the second signal with a predetermined threshold value.

Claims

1. A document conveying apparatus comprising:

a light source;

a first roller for conveying a conveyed document;

a second roller which contacts with the conveyed document and rotates as the document is conveyed;

a disk including a plurality of slits spaced apart with a predetermined interval in a rotation direction of the disk, the disk rotating in the rotation direction with a rotation speed, by the rotation of the second roller;

a light reception element at a position facing the light source with the disk interposed therebetween;

a first signal generator for generating a first signal in accordance with light received by the light reception element;

a second signal generator for generating a second signal obtained by removing, from the first signal, a noise component of the light according to the rotation speed of the disk; and

a controller for determining whether the document is conveyed by comparing the second signal with a signal value of a delayed signal obtained by delaying the second signal by a predetermined period of time, wherein the predetermined period of time is greater than zero.

2. The document conveying apparatus according to claim 1, wherein the noise component is determined to be a component of a frequency which is equal to or more than a number of rotations of the disk per second and equal to or less than four times the number of rotations of the disk per second.

3. The document conveying apparatus according to claim 1 further comprising an image capturing module for capturing an image of a conveyed document,

wherein the noise component is changed in accordance with a resolution with which the image of the conveyed document is captured.

4. A determination method for a document conveying apparatus including a light source, a first roller for conveying a conveyed document, a second roller which contacts with the conveyed document and rotates as the document is conveyed, a disk rotating with a rotation speed by the rotation of the second roller, and a light reception element at a position facing the light source with the disk interposed therebetween, the determination method comprising:

generating a first signal in accordance with a light received by the light reception element;

generating a second signal obtained by removing, from the first signal, a noise component according to a rotation speed of the disk; and

determining whether the document is conveyed in the document conveying apparatus, by comparing the second signal with a signal value of a delayed signal obtained by delaying the second signal by a predetermined period of time, wherein the predetermined period of time is greater than zero.

5. A computer-readable, non-transitory medium storing a computer program, wherein the computer program causes a document conveying apparatus which comprises a light source, a first roller for conveying a conveyed document, a second roller which contacts with the conveyed document and rotates as the document is conveyed, a disk rotating with a rotation speed by the rotation of the second roller, and a light reception element at a position facing the light source with the disk interposed therebetween, to execute a process, the process comprising:

generating a first signal in accordance with a light received by the light reception element;

generating a second signal obtained by removing, from the first signal, a noise component according to a rotation speed of the disk; and

determining whether the document is conveyed in the document conveying apparatus, by comparing the second signal with a signal value of a delayed signal obtained by delaying the second signal by a predetermined period of time, wherein the predetermined period of time is greater than zero.