Image forming apparatus, sensor mounting jig for image forming apparatus, and method for mounting sensor for image forming apparatus

An image forming apparatus comprising:

• a transmission-type photosensor including a light-emitting part and a light-receiving part, disposed on opposite sides of a media conveyance path, to detect a recording medium on the media conveyance path;
• and
• a sensor retainer to retain the light-emitting part and the light-receiving part, the sensor retainer including an angle viewer with scale marks for determining an angle of an optical axis of the photosensor relative to a vertical direction,
• wherein the media conveyance path is inclined relative to a horizontal direction, and the sensor retainer is adjustable such that the photosensor is disposed with an inclination of the optical axis of the photosensor relative to the vertical direction being within a predetermined adjusted range corresponding to the scale marks of the angle viewer.

A sensor mounting jig for an image forming apparatus, comprising:

• a jig body connectable to a sensor retainer of the image forming apparatus to retain a light-emitting part and a light-receiving part of a photosensor of the image forming apparatus;
• a suspended needle indicator having a length longer than a distance between the light-emitting part and the light-receiving part disposed on opposite sides of a media conveyance path, the needle indicator including one end portion freely rotatably disposed on the jig body at a position higher than the photosensor, and an indicator disposed on another end thereof;
• and
• an angle viewer with scale marks that mark an angle of an optical axis of the photosensor from a vertical direction,
• wherein the jig body when connected to the sensor retainer is adjustable such that the photosensor retained by the sensor retainer is disposed with the angle of the optical axis of the photosensor relative to the vertical direction being within a predetermined adjusted range.