Patent CA-2077956-A1 (CA)
Title: Image forming device for both unbound and bound originals
Inventor: GAO YONG
IPC: G03G15/00
Filed: 1992-09-10
Abstract: IMAGE FORMING DEVICE FOR BOTH UNBOUND AND BOUND ORIGINALS       ABSTRACT An image forming device having a dual direction lens system, a shading light compensation system, a page turner, a movable table for face-up loading both unbound and bound originals (documents/books), an image projection unit and a light guiding unit, a microcomputer-based control system and an image formation unit, is disclosed that provides the capability and flexibility of automatic and manual photocopying from both unbound and bound documents and books.("manual" means that turning pages of the originals and reloading them at a certain angle in a registered position are accomplished by user's hand, and "automatic" means the above work is fully conducted by said device, thereinafter) The automatic book photocopying is enabled in two ways, one of which is that a flat (180°) face-up opened original is left-right horizontally reciprocated by the movable table that the left and right pages of the original can be fed in turn into a registered position to be photocopied by using a vertical lens unit in the lens system and then each copied page of the original can be automatically turned by the page turner; the other is a dual direction photocopying with the lens system functioning in the two directions corresponding to both side pages of the original which is also face-up positioned on the table at an angle of less than 180° with the right side lying horizontally and the left side held at the angle between a supporting plate and a side platen of said device, while turning pages and repositioning the original can also be fully accomplished by said device. Unbound documents can also be face-up loaded on the movable table for the automatic photocopying with little volume limits and will never be jammed. On the other hand, having bound or unbound originals face-up positioned at a certain angle on the movable table of said device which can also be flexibly manipulated by user's hands, the manual photocopying can be more easier carried out in the ways of single or dual projecting direction. The movable table, comprising a platform transversally reciprocated by a closed-loop controlled servomotor and a frame vertically driven by another servomotor, has capability of multi direction manipulations to assist the photocopying. On the platform of the table there are installed a rotatable supporting plate which is also driven by another closed-loop controlled servomotor to hold the bound originals open at a certain angle for the dual direction photocopying, and a flat sliding plate which can be longitudinally slid in or out manually to provide one more dimension flexibility of handling the originals for the photocopying. The page turner having three direction mobility operates with suction force to turn pages of the bound or unbound originals in continuous manipulating processes combined with the photocopying processes which can be programmed in different operating modes corresponding to the above-mentioned different types of the automatic photocopying. The shading light compensation system is able to preset an image field of desired size for the photocopying and to eliminate the dark edge effect caused by different intensity of reflecting light due to different sized images of the originals against a standard size image field by using a set of adjustable foils to cover the images of those dark edges and by providing light compensation onto the foils so that dark edge shadows can be prevented from forming on copied papers with transferred images, and a wasteful consumption of the toner and a pollution of the transfer charger can also be avoided. The image projection unit, having a projecting housing, a group of orientated reflecting mirrors and two scaled viewing screens, is for monitoring the set-up of the originals of different size, so that the image orientation, field and size of the originals can be adjusted before the photocopying.