PAPER FEEDER AND IMAGE FORMING APPARATUS

To provide a paper feeder capable of automatically accurately detecting that no roll paper is set up without increasing the number of parts and of preventing processing for a case where the roll paper is set up from being carried out despite no roll paper set up.SOLUTION: A paper feeder includes an...

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Bibliographic Details
Main Author OKADA KATSUMI
Format Patent
LanguageEnglish
Japanese
Published 30.08.2023
Subjects
CONVEYING
CORRECTION OF TYPOGRAPHICAL ERRORS
HANDLING THIN OR FILAMENTARY MATERIAL
HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS,CABLES
i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME
LINING MACHINES
PACKING
PERFORMING OPERATIONS
PRINTING
SELECTIVE PRINTING MECHANISMS
STAMPS
STORING
TRANSPORTING
TYPEWRITERS
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Summary:To provide a paper feeder capable of automatically accurately detecting that no roll paper is set up without increasing the number of parts and of preventing processing for a case where the roll paper is set up from being carried out despite no roll paper set up.SOLUTION: A paper feeder includes an arm 91 having a sensor 93 and a roll 92 arranged and supporting the sensor and a roll unit so that the sensor and the roll unit abut on a surface of a roll paper. The roll paper has inside a paper tube so as to insert a cylindrical spool inside the paper tube and be attached on the paper feeder, thus being rotated in conjunction with a rotation of the spool. The roll is arranged in a different position from the sensor in a circumferential direction of the roll paper. The sensor has a detection accuracy to detect a step at a tip of the roll paper. The arm 91 is rotatable and to rotate in a range where the sensor is out of contact with the spool. By detecting an inclination K1 of a sensor signal at a passage of a tip of the roll paper through the roll unit and an inclination K2 of a sensor signal at a passage of the tip of the roll paper through the sensor, a presence/absence of a tip of the roll paper is determined.SELECTED DRAWING: Figure 10 【課題】部品数を増やすことなく、ロール紙がセットされていないことを自動的に精度良く検知できるとともに、ロール紙がセットされていないにも関わらず、ロール紙がセットされている場合の処理を行うことを防止できる給紙装置を提供する。【解決手段】アーム９１はセンサ９３とコロ９２とを配置し、センサとコロ部とがロール紙の表面に当接するように支持する。ロール紙は内側に紙管を有し、該紙管の内側に円筒状のスプールが挿通されて給紙装置に備えられ、スプールの回転と連動して回転する。コロはロール紙の円周方向においてセンサと異なる位置に配置される。センサはロール紙の先端の段差を検知可能な検知精度を有する。アーム９１は回動可能であり、センサがスプールに接しない範囲で回動する。ロール紙の先端がコロ部を通過する際のセンサ信号の傾きＫ１と、ロール紙の先端がセンサを通過する際のセンサ信号の傾きＫ２とを検出することにより、ロール紙の先端の有無を判断する。【選択図】図１０
Bibliography:Application Number: JP20220023941