FEEDING APPARATUS

摘要

A feeding apparatus includes a pickup roller arranged to pick and feed a medium downstream along a conveying path, a separating roller arranged downstream to the pickup roller for advancing the medium downstream, a brake roller arranged opposite to the separating roller, and a pressing structure arranged opposite to the pickup roller and operable to swing toward or away from the pickup roller according to the rotating direction of the brake roller. When the brake roller rotates for feeding mediums downstream, the pressing structure moves toward the pickup roller and applies a normal force required for picking the medium. But when the brake roller stops rotating downstream because multiple mediums are fed between the brake roller and the separating roller, the pressing structure moves away from the pickup roller and stops applying normal force, so as to control the medium-picking process.

主权项

1. A feeding apparatus arranged on a conveying path through which sheet-like mediums (90) are transmitted, comprising:
a pickup roller that is arranged to contact with the medium and rotatable to transmit the medium downstream along the conveying path; a separating roller that is arranged downstream to the pickup roller in the conveying path for receiving the medium transmitted by the pickup roller, the separating roller being rotatable to further advance the medium downstream along the conveying path; a pressing structure including a pressing part that is arranged opposite to the pickup roller; a brake roller pivoted to the pressing structure and arranged opposite to the separating roller, a first torque limiter being connected with the brake roller and the pressing structure to drive the pressing part to swing toward or away from the pickup roller according to the rotating direction of the brake roller, a reversing motor being connected with the brake roller via a third torque limiter, the third torque limiter providing an upstream braking force for the brake roller via the drive of the reversing motor, wherein when only one medium is transmitted between the separating roller and the brake roller, the brake roller rotates along with the separating roller downstream and drives the pressing structure to swing the pressing part toward the pickup roller by virtue of the first torque limiter so as to apply the normal force onto the mediums for the convenience of the pickup roller picking the medium, when more than one medium are transmitted between the separating roller and the brake roller, the brake roller is driven by the third torque limiter via the reversing motor to rotate upstream because friction forces among the mediums are smaller than the braking force of the brake roller so as to transmit the mediums which are not contacted with the separating roller back upstream along the conveying path, the brake roller further drives the pressing structure to swing the pressing part away from the pickup roller by virtue of the first torque limiter so as to release the normal force between the pickup roller and the medium and avoid more mediums being further transmitted downstream.