Sheet conveyor, cooling device, and image forming apparatus

摘要

A sheet conveyor includes a first conveyance belt, a second conveyance belt, a first driving roller, a second driving roller, a first gear, and a second gear. In switching between sandwich and separation states, an axial center of a rotation shaft of the first or second gear moves on a movement plane substantially perpendicular to a direction in which the first conveyance belt and the second conveyance belt convey a sheet. Where L represents diameter of a tooth edge circle of the second gear in unit of millimeter and T1 represents a chordal tooth thickness of the second gear, an acute-side angle θ in unit of degree (°) formed by the movement plane and an interaxial-center plane including the axial center of the rotation shaft of each of the first gear and the second gear in the sandwich state is within a range represented by the following Formula 1: Tan−1(2×T1/L)<|θ|<45°.

主权项

1. A sheet conveyor, comprising:
a first conveyance belt and a second conveyance belt to opposingly engage and convey a sheet; a first driving roller to rotate the first conveyance belt; a second driving roller to rotate the second conveyance belt; a first gear to transmit a rotation driving force to the first driving roller; and a second gear to engage the first gear and transmit, to the first gear, a rotation driving force of a driving source for rotating the second driving roller, wherein the first gear and the second gear engage each other in an opposing engagement state in which the first conveyance belt and the second conveyance belt opposingly engage and convey the sheet, and disengage from each other in a separation state in which the first conveyance belt and the second conveyance belt are separated from each other, in switching between the opposing engagement state and the separation state, an axial center of a rotation shaft of the first gear or the second gear moves on a movement plane substantially perpendicular to a direction in which the first conveyance belt and the second conveyance belt convey the sheet, and where L represents diameter of a tooth edge circle of the second gear in unit of millimeter and T1 represents a chordal tooth thickness of the second gear, an acute-side angle θ in unit of degree (°) formed by the movement plane and an interaxial-center plane including the axial center of the rotation shaft of the first gear and the axial center of the rotation shaft of the second gear in the opposing engagement state is within a range represented by the following Formula 1:
Tan−1(2×T1/L)<|θ|<45°.