JPH0181648U

JPH0181648U -

Info

Publication number: JPH0181648U
Application number: JP1987176865U
Authority: JP
Priority date: 1987-11-19
Filing date: 1987-11-19
Publication date: 1989-05-31

Description

[Brief explanation of the drawing]

第１図は本考案の原稿サイズ検知装置を装備し
た複写機の露光系を示す要部斜視図、第２図は原
稿サイズ検知のためのセンサーの配置図、第３図
は磁力発生手段を説明するための模式図、第４図
は従来の原稿サイズ検知装置をしめす斜視図であ
る。図中引照数字は以下の内容を表す。１……第１の移動光学枠体、２……第２の移動
光学枠体、３……アーム部材、３５……第２の磁
力発生手段、３７……光学センサ、６４……磁性
板。 Fig. 1 is a perspective view of the main parts of the exposure system of a copying machine equipped with the original size detection device of the present invention, Fig. 2 is a layout of the sensor for detecting the original size, and Fig. 3 explains the magnetic force generating means. FIG. 4 is a perspective view showing a conventional document size detection device. Reference numbers in the figure represent the following contents. DESCRIPTION OF SYMBOLS 1... First moving optical frame, 2... Second moving optical frame, 3... Arm member, 35... Second magnetic force generating means, 37... Optical sensor, 64... Magnetic plate.

Claims

[Claims for Utility Model Registration] (1) An arm member that has at least one bent part and bends in conjunction with the movement of a movable optical frame for scanning and exposing a document, and an arm member that can be used to scan and expose documents of various standard sizes. In the document size detection device, which is provided on the upper surface of the arm member and includes a plurality of detection means, the arm member has a connection at one end thereof that is rotatably connected to the main body of the image forming apparatus. Department,
Each of the other end portions is provided with a magnetic force generating means, and when the arm member is in the first state, the magnetic force generating means is magnetically connected to the movable optical frame;
When the arm member is in the second state, the magnetic force generating means provided on the arm member is connected to the image forming apparatus main body so that the magnetic force generating means can freely move the movable optical frame and the image forming apparatus main body toward and away from each other. A document size detection device comprising: (2) The document size detection device according to claim 1, wherein the first state is an open state and the second state is a closed state. (3) Either the magnetic force generating means provided in the main body of the image forming apparatus or the magnetic force generating means provided at one end of the arm member has a magnetic pole switching means. The document size detecting device according to claim 1, which is a registered utility model, wherein a magnetic repulsion force is generated between the two magnetic force generating means to separate the two from each other. (4) The document size detection device according to claim 3, wherein an arm member support member is provided below the bent portion of the arm member to prevent the arm member from sagging due to its own weight.