Patent ID: 6073923
Filing Date: 2000-06-13
Classification: B65H

Abstract:
A paper-feeding mechanism for a document duplicating machine, said paper-feeding mechanism being driven by a single power source and performs intermittent paper-loading control and continuous paper-conveying operations on a paper loader of the document duplicating machine, and comprising:a driving means, which is a motor capable of both clockwise and counterclockwise running operations, such that the paper-feeding mechanism is at a paper-conveying status when the motor is running clockwise, and a paper-loading and paper-conveying status when the motor is running counterclockwise;a paper-loading means, to carry out an intermittent paper sheet retrieval from the paper loader, said paper-loading means comprising:a paper-pressing cam, located above the paper loader, said paper-loading cam having a profile contour touching a base plate to control an up-and-down motion of the base plate;a paper-loading gear, located at a position above one side of the paper loader to cause a drive paper-loading operation;a paper-loading roller, co-axial and co-rotating with the paper-loading gear said paper-loading roller having a lower edge touching the top of a paper sheet in the paper loader when the paper-pressing cam causes the base plate to move upwards; anda paper-conveying means, to cause the paper sheet retrieved from the paper loader to move forward, said paper-conveying means comprising:a paper-conveying gear, to keep the paper-conveying operation at a constant direction regardless the running direction of the driving means;a paper-conveying roller, which is co-axial and co-rotating with the paper-conveying gear, having a lower roller surface to drive the paper forward;a paper-conveying idle wheel, which is meshed with the paper-conveying gear to maintain the paper-conveying gear rotating at the constant direction; anda paper-conveying-and-loading control means to separate the paper-conveying and paper-loading operations of the paper-feeding mechanism such that when the paper-feeding mechanism is in paper-conveying operation, the paper-conveying-and-loading control means driving the paper-loading idle wheel and the paper-pressing cam, respectively, to have the paper-conveying means performing paper-conveying and to have the paper-pressing cam driving the base plate downwards for terminating the contact between the paper in the paper loader and the paper-loading roller, and when the paper-feeding mechanism is in paper-conveying-and-loading operation, the paper-conveying-and-loading control means driving the paper-conveying gear, the paper-pressing cam, and the paper-loading gear, respectively, to cause the paper-conveying operation to proceed at a constant direction, a spring driving the base plate upwards for having the top paper sheet in the paper loader and the paper-loading roller into contact, and the paper-loading gear performing the paper-loading operation.