JPS6238244U

JPS6238244U -

Info

Publication number: JPS6238244U
Application number: JP12984285U
Authority: JP
Priority date: 1985-08-26
Filing date: 1985-08-26
Publication date: 1987-03-06

Description

[Brief explanation of the drawing]

第１図は本考案を適用した電子写真複写装置の
概略図、第２図は検知センサの配置状態を示す平
面図、第３図イ，ロはシート検知回路の一実施例
を示す回路図、第４図は判定回路の一実施例を示
す論理回路、第５図はシート搬送タイミング信号
のタイミングチヤートを示している。１：複写装置本体、２：原稿台、３：ドラム状
感光体（ドラム）、４，７：帯電器、５：ブラン
ク露光用ランプ、６：現像装置、８：クリーニン
グ装置、９：原稿、１０：ランプ、１１，１２：
ミラー、１３：結像レンズ、１４：スリツト板、
１５：カセツト、１６：送出しローラ、１７，１
８：ガイド板、１９：タイミングローラ、２０：
シート、２１：搬送ベルト、２２：定着ローラ、
２３：排紙トレイ、２４：第１のシート有無検知
センサ、２４ａ：第１の受光素子、２４ｂ：第１
の発光素子、２５：第２のシート有無検知センサ
、２５ａ：第１の受光素子、２５ｂ：第２の発光
素子。 FIG. 1 is a schematic diagram of an electrophotographic copying apparatus to which the present invention is applied, FIG. 2 is a plan view showing the arrangement of detection sensors, and FIGS. 3A and 3B are circuit diagrams showing one embodiment of a sheet detection circuit. FIG. 4 shows a logic circuit showing one embodiment of the determination circuit, and FIG. 5 shows a timing chart of a sheet conveyance timing signal. 1: Copying device main body, 2: Original table, 3: Drum-shaped photoreceptor (drum), 4, 7: Charger, 5: Blank exposure lamp, 6: Developing device, 8: Cleaning device, 9: Original, 10 : Lamp, 11, 12:
mirror, 13: imaging lens, 14: slit plate,
15: Cassette, 16: Delivery roller, 17,1
8: Guide plate, 19: Timing roller, 20:
sheet, 21: conveyor belt, 22: fixing roller,
23: Paper discharge tray, 24: First sheet presence detection sensor, 24a: First light receiving element, 24b: First
25: second sheet presence/absence detection sensor, 25a: first light receiving element, 25b: second light emitting element.

Claims

[Scope of utility model registration request]

In a sheet conveyance state quality detection device for a device that conveys sheets of relatively different widths, in a common area between a passage area for a first sheet having a relatively large width and a passage area for a second sheet having a relatively small width. a first sensing member provided in the area, a second sensing member provided in the difference area between the first sheet passing area and the second sheet passing area, and both sensing members when selecting the first sheet, detecting that a sheet is present. and a determination circuit that determines that the sheet conveyance state is good when only the first sensing member detects the presence of a sheet at the time of selecting the second sheet, and the first sensing member and the second sensing member are . A sheet conveyance state quality detection device, characterized in that the sheet conveyance state quality detection device is provided at a position where the conveyance leading edge of the first sheet can be simultaneously detected.