An image forming system includes an image forming apparatus, a first conveyance path, a sheet feeding unit, a sheet post-processing unit, and a controller. The image forming apparatus has a first feed portion, and an image forming portion. The sheet feeding apparatus has a sheet stacking portion, a second feed portion, a relay conveyance portion, and a remaining amount detecting portion. When, during continuous printing, the existing number of recording sheets present in a conveyance passage from a confluence portion to the first feed portion is more than the constituting number of recording sheets contained in one bundle of sheets and in addition the sensing result of the remaining amount sensor is equal to or less than a predetermined amount, the controller controls first feed portion such that the existing number of the recording sheets is less than the constituting number of recording sheets.

An image forming system includes an image forming apparatus, a first conveyance path, a sheet feeding unit, a sheet post-processing unit, and a controller. The image forming apparatus has a first feed portion, and an image forming portion. The sheet feeding apparatus has a sheet stacking portion, a second feed portion, a relay conveyance portion, and a remaining amount detecting portion. When, during continuous printing, the existing number of recording sheets present in a conveyance passage from a confluence portion to the first feed portion is more than the constituting number of recording sheets contained in one bundle of sheets and in addition the sensing result of the remaining amount sensor is equal to or less than a predetermined amount, the controller controls first feed portion such that the existing number of the recording sheets is less than the constituting number of recording sheets.

The static charge eliminator includes a charger including one or more charging units, and a grounded needle-shaped conductor. The charger is configured to charge an insulating film such that the absolute value of the surface potential of the insulating film is 3 kV or more. The needle-shaped conductor is arranged to generate a corona discharge between the needle-shaped conductor and the insulating film charged by the charger. Thereby, the static charges on the insulating film can be reliably eliminated.

The present subject matter describes determination of amount of print media present in an input tray of a printing system. In an example implementation of the present subject matter, a current operating torque of a motor that moves a pick arm for drawing print media from the input tray is monitored. The current operating torque is monitored while the pick arm is moved between a rest position and a pick-ready position. Based on the monitored operating torque, it is determined whether amount of print media present in the input tray is one of below and above a predefined amount of print media.

The present subject matter describes determination of amount of print media present in an input tray of a printing system. In an example implementation of the present subject matter, a current operating torque of a motor that moves a pick arm for drawing print media from the input tray is monitored. The current operating torque is monitored while the pick arm is moved between a rest position and a pick-ready position. Based on the monitored operating torque, it is determined whether amount of print media present in the input tray is one of below and above a predefined amount of print media.

The present subject matter describes determination of amount of print media present in an input tray of a printing system. In an example implementation of the present subject matter, a current operating torque of a motor that moves a pick arm for drawing print media from the input tray is monitored. The current operating torque is monitored while the pick arm is moved between a rest position and a pick-ready position. Based on the monitored operating torque, it is determined whether amount of print media present in the input tray is one of below and above a predefined amount of print media.

A printing device includes a printing section and a tray support section. The printing section performs printing on a medium. The tray support section supports a tray. The tray includes a placement surface configured to support the medium. The tray support section includes a positioning section that determines a placement position of the medium with respect to the tray.

A printing device includes a printing section and a tray support section. The printing section performs printing on a medium. The tray support section supports a tray. The tray includes a placement surface configured to support the medium. The tray support section includes a positioning section that determines a placement position of the medium with respect to the tray.

The static charge eliminator includes a charger including one or more charging units, and a grounded needle-shaped conductor. The charger is configured to charge an insulating film such that the absolute value of the surface potential of the insulating film is 3 kV or more. The needle-shaped conductor is arranged to generate a corona discharge between the needle-shaped conductor and the insulating film charged by the charger. Thereby, the static charges on the insulating film can be reliably eliminated.

A conveying device includes a blower and a conveyor. The blower blows air to a sheet material. The conveyor conveys the sheet material through a blowing region of the blower. The conveyor includes a surface movable member and a presser. The surface movable member conveys the sheet material with movement of a surface of the surface movable member, with a back side of the sheet material supported with the surface movable member. The presser presses at least a portion of a leading end of the sheet material toward the surface movable member in at least an area from a position upstream from the blowing region in a conveyance direction of the sheet material to a position in the blowing region of the blower.