Sheet feeding or delivering – Feeding – Separator and conveyor
Patent
1992-03-27
1993-06-29
Schacher, Richard A.
Sheet feeding or delivering
Feeding
Separator and conveyor
271114, 271119, 271227, 271242, 271902, 400636, B65H 306
Patent
active
052227243
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention is directed to a paper feeder for feeding sheets of cutform paper which is applied to a printer or a copying machine.
BACKGROUND ARTS
A paper feeding means for sequentially feeding sheets of cutform paper accommodated in a feed tray to a record/write portion or the like takes the following mechanism. Typically, the laminated cutform paper is pushed against a feed roller from the rear face. The uppermost cutform paper is fed out towards the paper feeding roller by a frictional force with the feed roller. Thereafter, the feed roller is brought into a loose rotating state, and a main paper feeding process is entrusted to the paper feeding roller.
In this type of feeding mechanism, however, if a pressure of contact between the uppermost cutform paper and the feed roller differs in respective parts in an axial direction, the cutform paper can not be fed out in a proper direction. Besides, the paper feeding roller which has taken over this operation pulls in the cutform paper in an as-inclined state. As a result, this causes not only inconveniences wherein an inclined original image is copied on the paper surface, and recording/writing processes are effected obliquely but also a problem of producing a paper jam and skew.
To cope with such problems, Japanese Patent Publication No. 58-6677 proposed an apparatus arranged as follows. At the onset of feeding the paper, the paper feeding roller makes reverse rotations, at which portion the cutform paper is restrained from being pulled in. The cutform paper is adjusted in the proper direction. At a stage of producing some sagging of the cutform paper, the feed roller is stopped. Simultaneously, the paper feeding roller is changed over to forward rotations. The cutform paper is thus properly pulled in the record/write portion.
This type of apparatus, however, presents the following problems. The paper feeding roller changed over to the forward rotations pulls in the cutform paper. During this process, fluctuations in intensive load based on a frictional contact between the feed roller and the cutform paper instantaneously when sagging disappears act on the cutform paper and the feed roller as well. In consequence, a pull-in deviation is caused, or the cutform paper is to be ruptured.
DISCLOSURE OF INVENTION
It is an object of the present invention, which has been devised in the light of such problems, to provide a paper feeder equipped with a novel driving force transmission mechanism which prevents abrupt fluctuations in load from acting on cutform paper and a paper feeding roller after a changeover to forward rotations has been effected.
To accomplish this object, according to one aspect of the invention, there is provided a paper feeder comprising: a feed roller for sequentially feeding sheets of laminated cutform paper; a paper feeding roller disposed forward in a paper feeding direction of the feed roller; a driving means for rotationally driving the paper feeding roller per paper feeding operation initially in anti-feeding direction and subsequently in the feeding direction; and a driving force transmitting means operating while interlocking with the driving means to rotate the feed roller in the feeding direction with a quantity enough to cause sagging of the cutform paper between the paper feeding roller and the feed roller during rotations in the anti-feeding direction of the paper feeding roller and subsequently, with a changeover of the paper feeding roller to rotations in the feeding direction, cause the feed roller to temporarily rotate in the feeding direction once again.
Based on this construction, proper sagging of the cutform paper is produced on this side of the paper feeding roller during initial rotations of the paper feeding roller in an anti-feeding direction, thereby adjusting the direction thereof. Subsequently, with rotations of the paper feeding roller in a paper feeding direction, the feed roller is temporarily rotated. As a result, the paper feeding roller is caused to perform an exact pull-in oper
REFERENCES:
patent: 4929105 (1990-05-01), Hirayama
patent: 4990011 (1991-02-01), Underwood
Hirano Seiichi
Murayama Susumu
Schacher Richard A,.
Seiko Epson Corporation
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