JPH0381946U

JPH0381946U -

Info

Publication number: JPH0381946U
Application number: JP14249489U
Authority: JP
Priority date: 1989-12-08
Filing date: 1989-12-08
Publication date: 1991-08-21

Description

[Brief explanation of drawings]

第１図１ないし５は本考案によるメンテナンス
ユニツト交換検知装置の一例の動作説明図、第２
図は交換検知される帯電チヤージヤの斜視図、第
３図は該帯電チヤージヤから分離した爪の斜視図
、第４図は交換検知に伴いメンテナンスカウンタ
をクリアする回路の一例のブロツク図、第５図は
この回路におけるフオトセンサからの信号のタイ
ミングチヤート、第６図はこのメンテナンスユニ
ツト交換検知装置が適用されるレーザプリンタの
概要構成図である。１０……プリンタ本体、１８……帯電チヤージ
ヤ、３８……爪、４０……検知レバー、４３……
フオトセンサ、４６……メンテナンスカウンタ。 1 to 5 are operation explanatory diagrams of an example of the maintenance unit replacement detection device according to the present invention;
3 is a perspective view of a claw separated from the electrification charger, FIG. 4 is a block diagram of an example of a circuit that clears a maintenance counter when replacement is detected, and FIG. 5 is a perspective view of a charger that detects replacement. is a timing chart of a signal from a photo sensor in this circuit, and FIG. 6 is a schematic diagram of a laser printer to which this maintenance unit replacement detection device is applied. 10... Printer body, 18... Charger, 38... Nail, 40... Detection lever, 43...
Photo sensor, 46...Maintenance counter.

Claims

[Claims for Utility Model Registration] 1. In an image forming apparatus such as a laser printer or a copying machine that is equipped with a maintenance unit such as a replaceable charger, a removable claw is provided on the side of the maintenance unit, and the main body of the image forming apparatus is provided with a removable claw. A detection lever is provided on the side, which is actuated by the pawl when the maintenance unit is set, and which can detach the pawl from the maintenance unit when the maintenance unit is removed, and a sensor that detects the operation of the detection lever. A maintenance unit replacement detection device for an image forming apparatus. 2. The maintenance unit replacement detection device for an image forming apparatus according to claim 1, wherein a maintenance counter is cleared by detection by the sensor.