US 6,206,368 B1 · Paper transport device with one roller pair

Abstract

In a paper transport device, a first roller serving as a separation roller is situated underneath a second roller serving as a document feed roller, together forming a roller pair. A rotary shaft of the separation roller is biased upward toward the document feed roller by means of an elastic element. One end of the rotary shaft is connected to a drive shaft via a coupler while a connecting bar is joined to the other end of the rotary shaft obliquely from above. An extreme end of the connecting bar opposite to the rotary shaft is attached to a support plate fixed to a main body of the paper transport device in such a way that the connecting bar can swing about pivot pin fixed to the support plate. In the paper transport device thus constructed, one end of the rotary shaft fitted to the coupler acts as a point of support, allowing the other end of the rotary shaft to move downward overwhelming an upward-lifting force of the elastic element when forced downward by the connecting bar. In this construction, the separation roller can be separated from and brought into contact with the document feed roller.

Claims20

Dependent claims

A paper transport device comprising:

a first roller pair including two first rollers arranged parallel to each other, said first rollers being movable into tight contact with each other and being displaceable from said tight contact by application of an external force;
a second roller pair including two second rollers arranged parallel to each other, said second rollers being movable into tight contact with each other when said first rollers are brought into tight contact with each other, and said second rollers being displaceable form said tight contact when said first rollers are displaced from said tight contacts;
a supporting member for rotatably supporting one of said second rollers, said supporting member being swingable about a pivot axis so that said one of said second rollers supported by said supporting member is movable into contact with or apart from another of said second rollers;
and
a leaf spring having one end attached to said supporting member for biasing said supporting member in a direction in which said one of said second rollers separates from said another one of said second rollers.

2 more elements

A paper transport device comprising:

a first roller pair including two first rollers arranged parallel to each other, said first rollers being movable into tight contact with each other and displaceable from said tight contact by application of an external force;
a second roller pair including two second rollers arranged parallel to each other, said second rollers being movable into tight contact with each other when said first rollers are moved into tight contact with each other, and said second rollers being displaceable from said tight contact when said first rollers are displaced from their tight contact;
a first supporting member for rotatably supporting one of said first rollers, said first supporting member being swingable about a specific pivot axis so that said one of said first rollers is movable into contact with or apart from another one of said first rollers;
a second supporting member for rotatably supporting one of said second rollers, said second supporting member being swingable about a specific pivot axis so that said one of said second rollers is movable into contact with or apart from another one of said second rollers;
a first elastic member having a first end fixed to said first supporting member and a second end free from attachment;
and
a second elastic member having a first end fixed to said second supporting member and a second end free from attachment.

4 more elements

Dependencies are inferred from the claim text.

Paper transport device with one roller pair

Life of this patent

Paper transport device with one roller pair

Life of this patent

Abstract

Claims20