JPH0395328U

JPH0395328U -

Info

Publication number: JPH0395328U
Application number: JP182690U
Authority: JP
Priority date: 1990-01-12
Filing date: 1990-01-12
Publication date: 1991-09-27

Description

[Brief explanation of drawings]

第１図は本考案の給紙装置を適用したプリンタ
の概略構成説明図、第２図及び第３図は給紙装置
の筐体的構成を示す説明図、第４図は分離ローラ
及び回転軸の斜視図、第５図は制御ブロツク図で
ある。１……給紙装置、Ｐ……記録紙、３……レジス
トローラ対、４……感光体、５……帯電チヤージ
ヤ、６……レーザ光学系、７……現像装置、８…
…転写チヤージヤ、９……定着装置、１１……排
出部、１７……分離ローラ（給紙ローラ）、１７
ａ……高摩擦領域、１７ｂ……低摩擦領域、１９
……手差給紙台、２１……収容部、２１ａ……底
板、２４……阻止部材、２４ａ……フリクシヨン
パツド、２５……スプリング。 Fig. 1 is a schematic configuration explanatory diagram of a printer to which the paper feeding device of the present invention is applied, Figs. 2 and 3 are explanatory diagrams showing the casing configuration of the paper feeding device, and Fig. 4 is a separation roller and rotating shaft. FIG. 5 is a control block diagram. DESCRIPTION OF SYMBOLS 1... Paper feeding device, P... Recording paper, 3... Registration roller pair, 4... Photoreceptor, 5... Charging charger, 6... Laser optical system, 7... Developing device, 8...
...Transfer charger, 9...Fixing device, 11...Discharge section, 17...Separation roller (paper feed roller), 17
a...High friction area, 17b...Low friction area, 19
. . . Manual paper feed tray, 21 . . . Storage portion, 21a . . . Bottom plate, 24 .

Claims

[Scope of Claim for Utility Model Registration] (1) A paper feed cassette installed in an image forming apparatus with its leading end in the conveyance direction inclined downward, and a manual paper feed stand provided above the paper feed cassette; a separation roller provided on the image forming apparatus main body side for contacting the upper surface of the leading edge of the recording paper on the paper feed cassette to take it out;
In a paper feeding device comprising a friction pad in contact with the lower surface of a separation roller, the circumferential surface of the separation roller is divided into a wide-area high-friction area and a narrow-area low-friction area along the circumferential direction. , the leading edge of the manual paper feed table is located behind and above the leading edge of the recording paper on the paper feeding cassette, and in a standby state before paper feeding starts, the low friction area is located below. It is possible to contact the recording paper on the paper feed cassette, and the recording paper on the manual paper feed tray is controlled so as to come into contact with the high friction area first by starting rotation of the separation roller. A paper feeding device having a manual paper feeding mechanism. (2) If the recording paper detection sensor located ahead of the separation roller does not detect the passage of recording paper even after a predetermined period of time has elapsed after the paper feeding operation by the separation roller, the separation roller is again A paper feeding device having a manual paper feeding mechanism, characterized in that it includes a control section that instructs to perform a paper feeding operation.