Original Publication Date: 1983-May-01
Included in the Prior Art Database: 2005-Feb-07
This mechanism provides a 180Œ rotating operation of a sheet on a plane.
This mechanism provides a 180OE rotating operation of a sheet on a plane.
In a duplex copier or printer, each sheet to be printedis fed twice through a copying or printing station I (Fig. 1). The sheet printed on its first side must be turned into a face-down state at the station II to provide its back side for the second pass through the copying or printing station. Then the face-down sheet, before the second pass, must be rotated 180OE on the plane at the station III.
Fig. 2 shows the structure of the sheet-rotating mechanism for use at the station III. It includes a motor which reverses its direction of rotation. Gear Gl is fixed on a motor shaft 1 and rotates in the same direction as the motor. Gear G2 is fixed on a roller shaft 2 and meshes with gear G1. Gear G3 is mounted on the motor shaft 1 through a one-way clutch 3 which allows the gear G3 to be driven only when the shaft 1 rotates in the direction shown by the arrow 4.
Gear G4 is mounted on the motor shaft l through another one-way clutch 5 which allows the gear G4 to be driven only when the shaft 1 rotates in the direction shown by the arrow 6. Gear G5 is a double gear that is fixed on a hollow tube 7 which is rotatably threaded by the roller shaft 2. The left teeth of the double gear G5 mesh with those of the gear G4, while the right small teeth of the double gear G5 are driven through an idler gear G6.
Roller Rl is fixed on the roller shaft 2 and rotates in any direction in accordance with the direction of roller shaft 2 rotation. Roller R2 is fixed on the hollow tube 7, and its direction of rotation coincides with that of the double gear G5 which rotates only in the direction shown by the arrow 8. Spherical roller R3 is mounted on roller shaft 2 through a one-way clutch 9 which allows the spherical roller R3 to be driven only when the roller shaft 2 rotates in the direction shown by another arrow 10. The outer surface of this roller R3 point-contacts the sheets. Pressure rollers 11, 12 and 13, engaging the rollers R1, R2 and R3, respectively, are mounted on an idler shaft 14 so they can freely rotate.
In operation, if the motor rotate...