JPH03103448U

JPH03103448U -

Info

Publication number: JPH03103448U
Application number: JP1034190U
Authority: JP
Priority date: 1990-02-05
Filing date: 1990-02-05
Publication date: 1991-10-28

Description

[Brief explanation of drawings]

第１図はこの考案の要部となる画像形成装置の
両面ユニツトとそれを制御する制御系を示す構成
図、第２図は同じくその両面ユニツトを挿着可能
な画像形成装置としての複写機を示す全体構成図
、第３図は両面ユニツトを複写機本体から再給紙
方向に直交する方向に引き出した状態を示す斜視
図、第４図は本体制御装置６０とユニツト制御装
置７０の接続状態における各部との関連構成を示
すブロツク図、第５図は第４図のユニツト制御装
置７０が実行する判断及び処理を示すフロー図、
第６図は主にジヤム検知に関連する各種の信号の
タイミングを示すタイミング図、第７図は両面ユ
ニツトが装置本体に対して用紙の再給紙方向に直
交する方向に引き出し可能であるときのジヤム処
理時における不都合を説明するための概略図であ
る。１……複写機本体（装置本体）、３……両面ユ
ニツト、２６……レジスト前センサ、３７……ト
レイ部、３８……給紙コロ、４１……再給紙搬送
路、４３……ジヤム紙検知用センサ、６０……本
体制御装置、７０……ユニツト制御装置（ジヤム
紙戻し制御手段）、Ｐ……転写紙（用紙）。 Figure 1 is a configuration diagram showing the duplex unit of an image forming apparatus which is the main part of this invention and the control system that controls it, and Figure 2 shows a copying machine as an image forming apparatus into which the duplex unit can be inserted. FIG. 3 is a perspective view showing the duplex unit pulled out from the copying machine main body in a direction perpendicular to the paper refeeding direction, and FIG. A block diagram showing the related structure of each part, FIG. 5 is a flow diagram showing the judgment and processing executed by the unit control device 70 of FIG. 4,
Fig. 6 is a timing diagram showing the timing of various signals mainly related to jam detection, and Fig. 7 is a timing diagram showing the timing of various signals mainly related to jam detection. FIG. 2 is a schematic diagram for explaining inconveniences during jam processing. DESCRIPTION OF SYMBOLS 1... Copying machine main body (apparatus main body), 3... Duplex unit, 26... Pre-registration sensor, 37... Tray section, 38... Paper feed roller, 41... Paper refeed conveyance path, 43... Jam Paper detection sensor, 60... Main body control device, 70... Unit control device (jam paper return control means), P... Transfer paper (paper).

Claims

[Scope of claim for utility model registration] A paper feed roller is provided for stacking paper with an image formed on one side and refeeding the paper,
In an image forming apparatus equipped with a duplex unit that is inserted into the apparatus main body so as to be pulled out in a direction perpendicular to a paper refeeding direction, the refeeding unit in the duplex unit on the downstream side of the paper feed roller is provided. A sensor is provided in the paper conveyance path to detect the presence or absence of paper, and when the sensor detects paper at a predetermined jam detection timing after the paper feed roller starts refeeding paper, the paper feed roller is moved to the sensor. An image forming apparatus equipped with a duplex unit, comprising a jam paper return control means for rotating the paper in a direction to return the paper to the duplex unit until the paper is no longer detected by the jam paper.