Patent ID: 8328191
Filing Date: 2012-12-11
Classification: B65H

Abstract:
1. A sheet material detection apparatus that detects passage of a sheet material over a sheet material transportation path, comprising: a lever member that is exposed over the transportation path and moves to change its position from a reference position when the sheet material is brought into contact therewith; a detecting section that detects the change in the position of the lever member; a holder that supports the lever member in such a manner that the lever member can turn freely toward both sides in a direction of the transportation of the sheet material at a guide-facing-surface side, the guide facing surface being a surface facing a guide surface along which the sheet material is guided over the transportation path; a counter weight with which the lever member moving to change the position is brought into contact, the counter weight moving to change its position due to contact with the lever member, the counter weight being thereafter brought into contact with the holder; and an urging member that urges the lever member after the change in the position toward the reference position, wherein the urging member is, for urging, in engagement with an engagement portion of the lever member that is located at a side opposite to a side of a contact portion of the lever member with a rotating shaft of the lever member being supported by the holder between the engagement portion and the contact portion, which is a portion with which the sheet material is brought into contact.