JPH0315847U

JPH0315847U -

Info

Publication number: JPH0315847U
Application number: JP7500089U
Authority: JP
Priority date: 1989-06-27
Filing date: 1989-06-27
Publication date: 1991-02-18
Anticipated expiration: 2004-06-27
Also published as: JP2559185Y2

Description

[Brief explanation of drawings]

第１図ａ，ｂはＣＦ用紙と、これに形成された
印字部の状況を説明し、第１図ｂは正常な位置に
画像が複写されたコピー紙を、第１図ｄは画像が
ずれて複写されたコピー紙をそれぞれ示す説明図
、第１Ａ図ａ，ｂは従来のスプロケツト孔検知方
法の不具合を示す説明図、第２図は複写機の一部
と自動原稿送り装置を示す断面図、第２Ａ図は第
１センサ、第２センサ及び用紙センサと、ＣＦ用
紙の関係を示す説明図、第２Ｂ図ａ乃至ｅは第１
及び第２センサの出力パルスと、それの検知方法
を説明する図、第３図ａ，ｂはシート原稿の排紙
態様を示す説明図、第４図は自動原稿送り装置の
全体回路ブロツク図、第５図乃至第１５図はＣＦ
Ｆモード時のフローチヤート、第１６図は孔検知
センサをｎ個設けたときの作用を示す図、第１７
図は切換手段の他の構成例を示すブロツク図、第
１８図は第１７図に示した構成に対応したタイミ
ングチヤート、第１９図は給紙指令発生手段の一
例を示すブロツク図である。１……コンピユータ用紙、３……スプロケツト
孔、５……自動原稿送り装置、６……プラテン、
１７……給紙口、１８……原稿排出手段、３６，
３６ａ，‥３６ｎ……孔検知センサ。 Figures 1a and b explain the situation of the CF paper and the printing area formed on it, Figure 1b shows copy paper with an image copied in the correct position, and Figure 1d shows a copy paper with an image misaligned. Figures 1A and 1A are explanatory diagrams showing the defects of the conventional sprocket hole detection method, and Figure 2 is a sectional view showing a part of the copying machine and the automatic document feeder. , FIG. 2A is an explanatory diagram showing the relationship between the first sensor, the second sensor, the paper sensor, and the CF paper, and FIGS. 2B a to e are the first
and a diagram explaining the output pulse of the second sensor and its detection method, FIGS. 3a and 3b are explanatory diagrams showing the manner in which sheet documents are ejected, and FIG. 4 is an overall circuit block diagram of the automatic document feeder. Figures 5 to 15 are CF
Flowchart in F mode, Fig. 16 is a diagram showing the operation when n hole detection sensors are provided, Fig. 17
This figure is a block diagram showing another example of the configuration of the switching means, FIG. 18 is a timing chart corresponding to the configuration shown in FIG. 17, and FIG. 19 is a block diagram showing an example of the paper feed command generating means. 1... Computer paper, 3... Sprocket hole, 5... Automatic document feeder, 6... Platen,
17...Paper feed port, 18...Document ejection means, 36,
36a,...36n...hole detection sensor.

Claims

[Claims for Utility Model Registration] An automatic document feeder for an image forming apparatus, which is equipped with a platen that supports a document in order to illuminate the document, and which is provided with a platen that faces the platen in order to convey the document on the platen. a conveyance member provided at In the automatic document feeder, the automatic document feeder has a hole detection means for detecting sprocket holes of computer paper for the purpose of printing, wherein the hole detection means includes a plurality of hole detection sensors for detecting different locations in the conveyance direction of the computer paper. An automatic document feeder featuring: