Belt transport device and belt transport control method

{
  "publication_number": "US7823720B2",
  "country": "US",
  "kind": "B2",
  "title": "Belt transport device and belt transport control method",
  "abstract": "A belt transport device includes: a drive roller which is driven by a power source; a driven roller which is held in a rotatable manner; an endless belt which is wound on the drive roller and the driven roller; a band-like detecting section which is arranged on the endless belt in a circumferential direction of the endless belt; a sensor which detects the band-like detecting section; a displacement unit which displaces a relative positional relationship between the band-like detecting section and the sensor in a width direction of the endless belt.",
  "claims": [
    "1. A belt transport device comprising: a drive roller which is driven by a power source; a driven roller which is held in a rotatable manner; an endless belt which is wound on the drive roller and the driven roller; a band-like detecting section which is arranged on the endless belt in a circumferential direction of the endless belt; a sensor which detects the band-like detecting section; a displacement unit which displaces a relative positional relationship between the band-like detecting section and the sensor in a width direction of the endless belt; and a controller which controls the displacement unit to displace the relative positional relationship so as to satisfy the expression Tx≠n×Ty in the range in which the band-like detecting section and the sensor are opposed to each other, where Tx is an oblique traveling cycle of the endless belt, Ty is a revolution cycle of the endless belt and n is a fraction not more than ½ or an integer of 1 or 2.",
    "2. The belt transport device according to claim 1, wherein the controller controls the displacement unit so as to displace the relative positional relationship by a distance equal to a width of the sensor for every revolution of the endless belt."
  ],
  "description_excerpt": "1. Technical Field The present invention relates to a belt transport device including a drive roller which is driven by a power source, a driven roller which is held in a rotatable manner, an endless belt which is wound on the drive roller and the driven roller, a band-like detecting section which is arranged on the endless belt in a circumferential direction of the endless belt, and a sensor which detects the band-like detecting section, and a belt transport control method. 2. Related Art In the past, as disclosed in JP-A-8-211693, JP-A-2006-248082 and Japanese Patent No. 3082452, belt transport devices had a drive roller, a driven roller and an endless belt. In addition, a detecting section was provided on the endless belt and a detector was provided at a position opposed to the detecting section. Accordingly, while the endless belt rotated in a circumferential direction of the belt, the detector was able to detect information such as positional information from the detecting section. However, there is a possibility that the detector may trace the same point in the detecting section when the endless belt circulates.\n\nFor example, when the endless belt does not obliquely travel and circulates, the detector traces the same point in the detecting section in a width direction. When a configuration for controlling the oblique traveling of the endless belt is employed and the endless belt circulates, there is a possibility that the detector may trace the same point in the detecting section in the width direction in accordance with an oblique traveling cycle of the endless belt. FIGS.",
  "cpc": [
    "B41J 11/007",
    "B65G 39/16"
  ],
  "ipc": [
    "B41J 29/38",
    "B65G 39/16",
    "B65G 43/00",
    "G03G 15/00"
  ],
  "assignees": [
    "SEIKO EPSON CORPORATON"
  ],
  "inventors": [
    "TABATA KUNIO",
    "SUZUKI TOSHIYUKI",
    "OSHIMA ATSUSHI"
  ],
  "filing_date": "2009-03-02",
  "publication_date": "2010-11-02",
  "grant_date": "2010-11-02",
  "priority_date": "2008-03-03",
  "application_number": "US-39623809-A",
  "family_id": "41012871",
  "citations": [
    "JP2001034025A",
    "JP2002108130A",
    "JP2004157152A",
    "JP2006227005A",
    "JP2006248082A",
    "JP2006347039A",
    "JP2007094128A",
    "JP2008087962A",
    "JPH06127037A",
    "JPH0656294A",
    "JPH08211693A",
    "US2002034400A1",
    "US2008213009A1",
    "US5153655A"
  ]
}