IMAGE FORMING APPARATUS

• Main Author: ISHIFUNE TARO
• Format: Patent
• Language: English; Japanese
• Published: 24.01.2019
• Subjects: CINEMATOGRAPHY; CONVEYING; CORRECTION OF TYPOGRAPHICAL ERRORS; ELECTROGRAPHY; ELECTROPHOTOGRAPHY; HANDLING THIN OR FILAMENTARY MATERIAL; HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS,CABLES; HOLOGRAPHY; i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; LINING MACHINES; MAGNETOGRAPHY; PACKING; PERFORMING OPERATIONS; PHOTOGRAPHY; PHYSICS; PRINTING; PRINTING MACHINES OR PRESSES; SELECTIVE PRINTING MECHANISMS; STAMPS; STORING; TRANSPORTING; TYPEWRITERS

To provide an image forming apparatus capable of inhibiting erroneous judgement of a last sheet in a last-sheet detection mechanism using a rotor.SOLUTION: An image forming apparatus has a loading part on which recording materials are loaded, feed means that feed the recording material loaded on the loading part, a rotor that contacts a lowermost recording material out of a plurality of recording materials loaded on the loading part, an output part that outputs a pulse signal depending upon a rotational state of the rotor, and determination means that determines that when a pulse width of the pulse signal outputted from the output part is shorter than a predetermined pulse width, the recording material being fed by the feed means is not the last recording material left on the loading part and determines that when the pulse width is longer than the predetermined pulse width, the recording material being fed by the feed means is the last recording material left on the loading part, and further has change means that changes the predetermined pulse width depending upon the kind of the recording material loaded on the loading part.SELECTED DRAWING: Figure 6 【課題】 回転体を用いたラスト紙検知機構において、ラスト紙の誤判定を抑制する画像形成装置を提供する。【解決手段】 本発明は、記録材が載置される載置部と、前記載置部に載置された記録材を給送する給送手段と、前記載置部に載置された複数枚の記録材のうち最下位の記録材と接触する回転体と、前記回転体の回転状態に応じてパルス信号を出力する出力部と、前記出力部から出力される前記パルス信号のパルス幅が所定のパルス幅よりも短い場合、前記給送手段によって給送されている記録材は前記載置部に残った最後の記録材ではないと判定し、前記パルス幅が所定のパルス幅よりも長い場合、前記給送手段によって給送されている記録材は前記載置部に残った最後の記録材であると判定する判定手段と、を有する画像形成装置において、前記載置部に載置された記録材の種類に応じて、所定のパルス幅を変更する変更手段を有することを特徴とする。【選択図】 図６