IMAGE FORMING APPARATUS

摘要

An image forming apparatus comprises a paper detection mechanism configured to detect papers passing through a conveyance path. The paper detection mechanism includes a rotation shaft which extends in a direction orthogonal to a conveyance direction of the paper; a lever integrally arranged on the rotation shaft; a torsion coil spring which is arranged around the outer periphery of the rotation shaft to energize the front end of the lever so that the lever protrudes to the conveyance path; and a sensor which detects the conveyance of paper when the lever pressed by the paper pivots. The torsion coil spring integrally includes a main coil part which is composed of a plurality of turns of coil and has a preset diameter, and a large diameter coil part which is larger in diameter than the main coil part and less in the number of turns than the main body coil part.

主权项

1. An image forming apparatus, comprising:
a paper conveyance section configured to guide paper along a conveyance path and a paper detection mechanism configured to detect the paper passing through the conveyance path; wherein the paper detection mechanism comprises:
a rotation shaft configured to extend in a direction orthogonal to a conveyance direction of the paper passing through the conveyance path;a lever integrally configured on the rotation shaft;a bearing configured to support the rotation shaft;a torsion coil spring, which is arranged around the outer periphery of the rotation shaft to energize the front end of the lever so that the lever protrudes to the conveyance path, configured to integrally include a main coil part which is composed of a plurality of turns of coil and has a preset diameter, and, a large diameter coil part which is larger in diameter than the main coil part and less in the number of turns than the main body coil part; anda sensor configured to detect the conveyance of paper when the lever pressed by the paper passing through the conveyance path pivots.