JPH0241255U

JPH0241255U -

Info

Publication number: JPH0241255U
Application number: JP11926088U
Authority: JP
Priority date: 1988-09-13
Filing date: 1988-09-13
Publication date: 1990-03-22
Anticipated expiration: 2003-09-13
Also published as: JPH08696Y2

Description

[Brief explanation of the drawing]

第１図は本考案の実施例の複写機の要部及びこ
れに装着された原稿搬送ユニツトを示す側断面図
、第２図はその制御系のブロツク図、第３図はそ
の複写機の操作部の要部を示す平面図、第４図乃
至第６図はその実施例の装置でシートスルーモー
ドで複写を行なう場合の主要動作のフローチヤー
トである。１……複写機本体、２……コンタクトガラス、
３……ハロゲンランプ、４……照明ユニツト（露
光走査ユニツト）、２６……基準パターン、２７
……パターンセンサ、２８……トナー補給ローラ
、３０……シートスルーユニツト（原稿搬送ユニ
ツト）、３１……搬送ローラ、３２……入口セン
サ（原稿挿入検知手段）、４４……照明ユニツト
固定センサ。 Fig. 1 is a side sectional view showing the main parts of a copying machine according to an embodiment of the present invention and the document transport unit installed therein, Fig. 2 is a block diagram of its control system, and Fig. 3 is an operation of the copying machine. 4 to 6 are flowcharts of the main operations when copying is performed in the sheet-through mode using the apparatus of this embodiment. 1...Copier main body, 2...Contact glass,
3...Halogen lamp, 4...Illumination unit (exposure scanning unit), 26...Reference pattern, 27
. . . Pattern sensor, 28 . . . Toner replenishment roller, 30 .

Claims

[Scope of Claim for Utility Model Registration] A contact glass on which an original is placed, an exposure scanning unit that exposes and scans the original placed on the contact glass at a constant speed to form an electrostatic latent image on a photoreceptor; A developing device that develops an electrostatic latent image into a toner image, a reference pattern having a reference density provided on the lower surface of the contact glass at a position outside the document placement range, and configured to perform the above exposure every predetermined number of image formations. With the scanning unit placed in a first position where the reference pattern can be irradiated, the reference pattern is exposed by the exposure scanning unit to form a latent image thereof on the photoreceptor, and the latent image is developed by the developing device to form a toner pattern; In a copying machine that optically detects the density and the surface density of the photoreceptor and replenishes toner to the developing device based on the ratio, the original is placed on a contact glass at a constant speed, and is removable from the copying machine. a document transport unit that transports the document through a predetermined exposure position; when the document transport unit is installed in a copying machine, the exposure scanning unit is fixed at a second position capable of irradiating the document at the exposure position; A document moving image reading mode is set, and every time a predetermined number of images are formed, the exposure scanning unit is moved from the second position to the first position, exposes the reference pattern, and returns to the second position. A copying machine characterized by being provided with a control device that controls the copying machine.