Sheet thickness sensing technique and recording head automatic adjusting technique of ink jet recording apparatus using same
AssigneeSamsung Electronics Co., Ltd.
InventorYoung-Bok Ju
Life of this patent
Estimating the term…
Abstract
A sheet thickness sensing apparatus of an image recording apparatus includes a thickness sensing circuit for generating a sheet thickness value corresponding to a reflective optical quantity sensed by a reflective optical sensor which is separately installed opposite to a reflective surface moving correspondingly according to the thickness of a fed sheet. A head driving enable time or a head gap is adjusted correspondingly to the thickness of the sheet.
Claims28
A method for automatically adjusting a recording head in an ink jet recording apparatus having a thickness sensing apparatus which is installed at a sheet convey path and senses the thickness of a fed sheet, said method comprising the steps of:
- sensing the thickness of said sheet by said thickness sensing apparatus when said sheet reaches said thickness sensing apparatus after said sheet is fed;
- said thickness being sensed by a reflective optical sensor which is separately installed opposite to a reflective surface moving correspondingly according to the thickness of a fed sheet;
- and
- adjusting a head driving enable time of said recording head correspondingly to the sensed thickness of said sheet.
A method for automatically adjusting a recording head in an ink jet recording apparatus having a thickness sensing apparatus which is installed at a sheet convey path and senses the thickness of a fed sheet and having a gap adjusting apparatus for adjusting the height of said recording head, said method comprising the steps of:
- sensing the thickness of said sheet by said thickness sensing apparatus when said sheet reaches said thickness sensing apparatus after said sheet is fed;
- said thickness being sensed by a reflective optical sensor which is separately installed opposite to a reflective surface moving correspondingly according to the thickness of a fed sheet;
- and
- adjusting a head gap between said recording head and said sheet correspondingly to the sensed thickness of said sheet by said gap adjusting apparatus.
A sheet thickness sensing apparatus of an image recording apparatus, comprising:
- feed roller for conveying a fed sheet;
- a friction roller assembly having a friction roller which is in contact with said feed roller and having a friction roller guide which fixes said friction roller elastically and has a reflective surface, said friction roller assembly pressing said sheet to said feed roller by said friction roller;
- and
- a thickness sensing circuit having a reflective optical sensor which is separately installed opposite to said reflective surface of said friction roller guide, said thickness sensing circuit generating a sheet thickness value corresponding to a reflective optical quantity from said reflective surface sensed by said reflective optical sensor.
A recording head automatic adjusting apparatus of an ink jet recording apparatus, comprising:
- a thickness sensing apparatus installed at a sheet convey path, for sensing the thickness of a fed sheet;
- said thickness sensing apparatus comprising:
- feed roller for conveying a fed sheet to a recording head;
- a friction roller assembly having a friction roller which is in contact with said feed roller and having a friction roller guide which fixes said friction roller elastically and has a reflective surface, said friction roller assembly pressing said sheet to said feed roller by said friction roller;
- and
- a thickness sensing circuit having a reflective optical sensor which is separately installed opposite to said reflective surface of said friction roller guide, said thickness sensing circuit generating a sheet thickness value corresponding to a reflective optical quantity from said reflective surface;
- and
- a controller for adjusting a head driving enable time of a recording head correspondingly to the thickness of the sheet sensed by said thickness sensing apparatus.
A recording head automatic adjusting apparatus of an ink jet recording apparatus, comprising:
- a thickness sensing apparatus installed at a sheet convey path, for sensing the thickness of a fed sheet;
- said thickness sensing apparatus comprising:
- feed roller for conveying said fed sheet to said recording head;
- a friction roller assembly having a friction roller which is in contact with said feed roller and having a friction roller guide which fixes said friction roller elastically and has a reflective surface, said friction roller assembly pressing said sheet to said feed roller by said friction roller;
- and
- a thickness sensing circuit having a reflective optical sensor which is separately installed opposite to said reflective surface of said friction roller guide, said thickness sensing circuit supplying a sheet thickness value corresponding to a reflective optical quantity from said reflective surface to said controller;
- a gap adjusting apparatus for adjusting the height of a recording head;
- and
- a controller for adjusting a head gap between said recording head and said sheet by controlling said gap adjusting apparatus so as to correspond to the thickness of said sheet sensed by said thickness sensing apparatus.
Dependencies are inferred from the claim text.