Typewriting machines – Sheet or web – For feeding web record-medium
Patent
1995-08-24
1996-11-12
Eickholt, Eugene H.
Typewriting machines
Sheet or web
For feeding web record-medium
400624, 271109, 271121, 271165, 271167, B41J 1126
Patent
active
055733387
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a document input device such as of a copying machine, facsimile and the like, and it also relates to an automatic paper feeder mounted to the document input device to convey documents (papers carrying data to be read out) into the document input device.
BACKGROUND ART
An automatic paper feeder mounted to, for example, a copying machine includes a pick roller which takes out papers one by one from a stack of papers placed on a paper feed tray, and a feed roller for conveying the papers that are taken out by the pick roller. The pick roller is arranged to come into contact with the leading end of the lower surface of the lowermost paper of the stack of papers placed on the paper feed tray, and is rotated in a predetermined direction to take out the papers.
To take out the papers one by one, a pick spring and a separator pad are arranged to come into contact with the pick roller from the upper direction. The separator pad has a width narrower than the pick roller and is arranged nearly at the center in the axial direction of the pick roller. The pick spring has the shape of a fork with its two legs arranged to come into contact with the pick roller on both sides of the separator pad. The pick spring pushes the paper onto the pick roller, so that the lowermost paper of the stack of papers is brought into frictional engagement with the pick roller; i.e., as the pick roller rotates, the paper is drawn by the pick roller due to frictional force. The separator pad is made of a rubber sheet or the like, comes into frictional engagement with the upper surface of a second paper from the lower side which is not in direct contact with the pick roller, and prevents the second paper from advancing together with the paper that is being taken out. Thus, the lowermost paper only is separated and is taken out while preventing a plurality of other papers from being taken out overlapped one upon the other.
In the automatic paper feeder, a variety of papers having different thicknesses and different stiffnesses are used. It is therefore desired that the automatic paper feeder is capable of separating and taking out a variety kinds of papers reliably one by one. Furthermore, in the automatic paper feeder, a failure in picking papers may occur when the amount of papers stacked on the paper feed tray decreases.
In order for the papers to be reliably taken out up to the last piece without picking miss, it is desired that a position (picking position) at which the pick spring comes into contact with the pick roller is located slightly on the upstream side of a position (separating position) at which the separator pad comes into contact with the pick roller in the direction in which the paper is fed. In this case, however, a gap is formed between the picking position and the separating position, and an increase in the gap invites an occurrence of paper jamming between the picking position and the separating position. Therefore, difficulty is involved in determining whether the pick spring and the separator pad be arranged at positions close to each other or whether they be arranged at positions remote from each other in the stage of designing. So far, the picking position has been located on the upstream side of the separating position by only a small amount in the direction in which the paper is fed, so that the papers are reliably taken out up to the last piece resulting, however, in the occurrence of pick miss as the amount of papers decreases. Moreover, the pick spring and the separator pad are interfered by each other in regard to their positions when they are arranged at positions very close to each other in the direction in which the paper is fed. To avoid this, therefore, the pick spring has been formed in the shape of a fork with its both legs being located on both sides of the separator pad.
In order to reliably separate the paper by the frictional force, furthermore, the separator pad must be brought into the pick roller with a strong force of contact, or the separator p
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Futatsuka Masahiko
Ishida Satoshi
Masuda Minoru
Miyauchi Yasunori
Morikawa Shuichi
Eickholt Eugene H.
Fujitsu Limited
PFU Limited
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