Quantcast

Pressing force adjustable roller unit, transport system of sheet member in image processing apparatus therewith and supply system of sheet member in image processing apparatus

Imported: 24 Feb '17 | Published: 06 Jan '04

Takao Araki, Kosuke Takaki

USPTO - Utility Patents

Abstract

There are disclosed a pressing force adjustable roller unit, a sheet member or transport system in an image processing apparatus provided with the roller unit, and a sheet member supply system in which multi-transport can securely be prevented. In a holder to which a roller is attached via a holding shaft to move the roller in a load direction from a peripheral surface, a torsion spring is connected in a direction in which the holding shaft is pressed downward, a windup degree of a winding portion of the torsion spring is adjusted by engagement of an engaging arm projecting from the winding portion with a first or second stopper disposed on a holder side, and a roller pressing force can therefore be adjusted. There are also provided a hopper for piling sheets, a supply roller for picking up and feeding out the sheet, and a multi-transport preventing roller pair of a separation roller and a retard roller so that the hopper can vertically move with respect to the supply roller. When the sheet multi-transport is detected by a multi-transport detection sensor, disposed on an immediate downstream side of the separation roller and retard roller, for detecting the sheet multi-transport, the hopper is shifted in a downward direction apart from the supply roller, a nipping force between the separation roller and retard roller is reduced, and a retard roller rotation torque is increased.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic perspective view of an image scanner provided with a sheet member supply system according to the present invention.

FIG. 2 is a schematic view from an automatic sheet supply apparatus hopper to a sheet transport path and a collection tray.

FIG. 3A is a side view showing a main part of a structure for incorporating a supply roller, separation roller and retard roller into a main body,

FIG. 3B is a schematic view showing a main part for adjusting an urging force of the retard roller, and

FIG. 3C is a schematic view showing the main part for adjusting the urging force of the retard roller.

FIG. 4 is a side view showing a main part of the sheet member supply system according to the present invention.

FIG. 5 is a schematic side view showing a main part of a system for a hopper tilting operation.

FIG. 6 is a side view showing a main part of the sheet member supply system during sheet multi-transport.

FIG. 7A is a diagram showing a relation between a pressing force of the separation roller and retard roller and a friction force,

FIG. 7B is a diagram showing a relation of the friction forces when one sheet is supplied, and

FIG. 7C is a diagram showing a relation of the friction forces during multi-transport of two sheets.

FIG. 8 is a graph showing a relation between a set torque of the retard roller and the pressing force to the retard roller.

FIG. 9 is a control flowchart of the sheet member supply system in the present invention.

FIG. 10 is a partially cut right side view of a roller unit according to the present invention.

FIG. 11 is a bottom view of the roller unit in FIG.

10.

FIG. 12A is a front view of the roller unit in FIG. 10,

FIG. 12B is a partial enlarged view of B portion in FIG. 12A, and

FIG. 12C is a sectional view taken along a line XIIC—XIIC in FIG.

12B.

FIG. 13 is a partially cut right side view of the roller unit when an urging force of a torsion spring is strengthened.

FIG. 14 is a schematic perspective view of the image scanner provided with the sheet member supply system according to the present invention.

FIG. 15 is a schematic view from the automatic sheet supply apparatus hopper to the sheet transport path and collection tray.

FIG. 16 is a schematic view showing a typical example of a sheet supply apparatus provided with a conventional multi-transport prevention system.

Claims

1. A sheet member supply system in an image processing apparatus, provided with a hopper on which sheet members are piled, a supply roller for picking up said piled sheet members and feeding out the sheet members to an image processing system, a multi-transport preventing roller pair of a separation roller and a retard roller disposed on a downstream side of said supply roller and in an entrance to said image processing system, said hopper being movable with respect to said supply roller, said sheet member supply system comprising:

2. The sheet member supply system in the image processing apparatus according to claim 1 wherein said retard roller is included in a retard motor driving system utilizing a DC motor whose output shaft rotation torque is variable in accordance with a current application amount.