Abstract: A hinge device which can be readjusted easily by bringing a rotating member into contact with a friction member. A first fixing member 10 fixed to a copying machine 1 and a second fixing member 11 fixed to an ADF 2 are connected to each other by means of a first shaft member 13 bearing them so as to be free to rotate; the member 10 has a rotating member 7 fixed to a second shaft member 16 arranged in parallel with the shaft member 13. The member 7 is put into contact with a friction member 15 arranged on the shaft member 13 to form a frictional portion. The member 15 is always in contact with the member 7 on its surface. A hole for bearing the shaft member 16 is an oblong hole 14, with its bottom surface which allows the shaft member 16 to take rocking motions for an arbitrary adjustment of a contact pressure to the member 7.

Abstract: A hinge apparatus employs a base, a second base, link arms, urging means and the characteristics of a parallelogram formed by the shape of said base, second base and paired link members to enable a body such as a platen cover to rotate up open and lower substantially parallel to an original platen and to enable the parallel opening of the body thereby ensuring the complete covering of a thick original or a book original placed upon the clear glass platen enabling good quality copies of the original regardless of its thickness.

Abstract: It is an object of the present invention to provide a hinge apparatus that can perform both the rotating function along with a rising and lowering action to allow the platen cover to cover the thick book original both horizontally and parallelly without damaging the book or causing mis-positioning of said book.