Recording-medium conveying device conveying a recording medium on a conveying belt charged with a positive charge and a negative charge alternately

A recording-medium conveying device conveying a recording medium to an image recording part, the recording medium being separated and fed from a recording-medium feeding device by a separating unit thereof, the recording-medium conveying device comprising:

• a conveying belt wound around a driving roller and a driven roller so as to convey said recording medium to said image recording part, the conveying belt having a two-layer structure composed of an insulating layer formed at one side contacting said recording medium and a conductive layer formed at the other side not contacting said recording medium;
• a belt charging unit provided in contact with said insulating layer in a vicinity of said separating unit so as to charge said insulating layer with a positive charge and a negative charge alternately in a moving direction of said conveying belt by applying an AC bias to said conveying belt;
• and
• a pressing roller pressing said conveying belt against said driving roller by exerting an elastic force so as to prevent said conveying belt from slipping on said driving roller,
• wherein a first length of a path along which the recording medium travels after being separated by the separating unit and until the recording medium contacts the conveying belt is greater than a second length along the conveying belt from a position of the belt charging unit to a position at which the recording medium contacts the conveying belt.

A recording-medium conveying device conveying a recording medium to an image recording part, the recording medium being separated and fed from a recording-medium feeding device by a separating unit thereof, the recording-medium conveying device comprising:

• a conveying belt wound around a central part of a driving roller and a central part of a driven roller so as to convey said recording medium to said image recording part, the conveying belt being narrower than said recording medium, and having a two-layer structure composed of an insulating layer formed at one side contacting said recording medium and a conductive layer formed at the other side not contacting said recording medium;
• conveyance guides provided at both sides of said conveying belt in a widthwise direction thereof in said image recording part, the conveyance guides having a plurality of ribs and recession grooves alternately, each of said ribs and said recession grooves being aligned along a conveying direction of said recording medium;
• a belt charging unit provided in contact with said insulating layer in a vicinity of said separating unit so as to charge said insulating layer with a positive charge and a negative charge alternately in a moving direction of said conveying belt by applying an AC bias to said conveying belt;
• and
• a pressing roller pressing said conveying belt against said driving roller by exerting an elastic force so as to prevent said conveying belt from slipping on said driving roller.

A recording-medium conveying device conveying a recording medium to an image recording part, the recording medium being separated and fed from a recording-medium feeding device by a separating unit thereof, the recording-medium conveying device comprising:

• a conveying belt wound around a central part of a driving roller and a central part of a driven roller so as to convey said recording medium to said image recording part, the conveying belt being narrower than said recording medium, and having a two-layer structure composed of an insulating layer formed at one side contacting said recording medium and a conductive layer formed at the other side not contacting said recording medium;
• conveyance guides provided at both sides of said conveying belt in a widthwise direction thereof in said image recording part, the conveyance guides having a plurality of ribs and recession grooves alternately, each of said ribs and said recession grooves being aligned along a conveying direction of said recording medium;
• and
• a belt charging unit provided in contact with said insulating layer in a vicinity of said separating unit so as to charge said insulating layer with a positive charge and a negative charge alternately in a moving direction of said conveying belt by applying an AC bias to said conveying belt,
• wherein at least one of said driving roller and said driven roller is a grip roller having a plurality of projections.

A recording-medium conveying device conveying a recording medium to an image recording part, the recording medium being separated and fed from a recording-medium feeding device by a separating unit thereof, the recording-medium conveying device comprising:

• a conveying belt wound around a driving roller and a driven roller so as to convey said recording medium to said image recording part, the conveying belt having a two-layer structure composed of an insulating layer formed at one side contacting said recording medium and a timing belt formed by a conductive layer at the other side not contacting said recording medium;
• and
• a belt charging unit provided in contact with said insulating layer in a vicinity of said separating unit so as to charge said insulating layer with a positive charge and a negative charge alternately in a moving direction of said conveying belt by applying an AC bias to said conveying belt,
• wherein a first length of a path along which the recording medium travels after being separated by the separating unit and until the recording medium contacts the conveying belt is greater than a second length along the conveying belt from a position of the belt charging unit to a position at which the recording medium contacts the conveying belt.

A recording-medium conveying device conveying a recording medium to an image recording part, the recording medium being separated and fed from a recording-medium feeding device by a separating unit thereof, the recording-medium conveying device comprising:

• a conveying belt wound around a central part of a driving roller and a central part of a driven roller so as to convey said recording medium to said image recording part, the conveying belt being narrower than said recording medium, and having a two-layer structure composed of an insulating layer formed at one side contacting said recording medium and a timing belt formed by a conductive layer at the other side not contacting said recording medium;
• and
• conveyance guides provided at both sides of said conveying belt in a widthwise direction thereof in said image recording part, the conveyance guides having a plurality of ribs and recession grooves alternately, each of said ribs and said recession grooves being aligned along a conveying direction of said recording medium;
• and
• a belt charging unit provided in contact with said insulating layer in a vicinity of said separating unit so as to charge said insulating layer with a positive charge and a negative charge alternately in a moving direction of said conveying belt by applying an AC bias to said conveying belt.

A recording-medium conveying device conveying a recording medium to an image recording part, the recording medium being separated and fed from a recording-medium feeding device by a separating unit thereof, the recording-medium conveying device comprising:

• a conveying belt wound around a driving roller and a driven roller so as to convey said recording medium to said image recording part, the conveying belt having a two-layer structure composed of an insulating layer formed at one side contacting said recording medium and a conductive layer formed at the other side not contacting said recording medium;
• a belt charging unit provided in contact with said insulating layer in a vicinity of said separating unit so as to charge said insulating layer with a positive charge and a negative charge alternately in a moving direction of said conveying belt by applying an AC bias to said conveying belt;
• and
• a pressing roller pressing said conveying belt against said driving roller by exerting an elastic force so as to prevent said conveying belt from slipping on said driving roller,
• wherein one of said driving roller and said driven roller positioned upstream in a conveying direction of said recording medium has a large diameter, and the other of said driving roller and said driven roller positioned downstream in the conveying direction of said recording medium has a small diameter.

A recording-medium conveying device conveying a recording medium to an image recording part, the recording medium being separated and fed from a recording-medium feeding device, the recording-medium conveying device comprising:

• a conveying belt wound around a driving roller and a driven roller, the driving roller being connected to a ground, so as to convey said recording medium to said image recording part, the conveying belt having an insulating layer formed at a side contacting said recording medium;
• a belt charging unit provided opposite said driving roller at a position upstream in a revolving direction of said driving roller from a position at which said recording medium fed from said recording-medium feeding device contacts said conveying belt wound around said driving roller so as to charge said conveying belt with a positive charge and a negative charge alternately in a moving direction of said conveying belt by applying an AC bias to said conveying belt;
• and
• a pressing roller provided opposite said driving roller at a position downstream in the revolving direction of said driving roller from said belt charging unit so as to press said recording medium stuck fast to said conveying belt closely to said conveying belt.

A recording-medium conveying device conveying a recording medium to an image recording part, the recording medium being separated and fed from a recording-medium feeding device, the recording-medium conveying device comprising:

• a conveying belt wound around a driving roller and a driven roller so as to convey said recording medium to said image recording part, the conveying belt having an insulating layer formed at at least a side contacting said recording medium;
• and
• a belt charging unit provided in contact with said conveying belt and in a vicinity of a separating unit so as to charge said conveying belt with a positive charge and a negative charge alternately in a moving direction of said conveying belt by applying an AC bias to said conveying belt,
• wherein said insulating layer has a volume resistivity equal to or more than 1012 Ωcm.

A recording-medium conveying device conveying a recording medium to an image recording part, the recording medium being separated and fed from a recording-medium feeding device, the recording-medium conveying device comprising:

• a conveying belt wound around a driving roller and a driven roller so as to convey said recording medium to said image recording part, the conveying belt having an insulating layer formed at at least a side contacting said recording medium;
• a belt charging unit provided in contact with said conveying belt and in a vicinity of a separating unit so as to charge said conveying belt with a positive charge and a negative charge alternately in a moving direction of said conveying belt by applying an AC bias to said conveying belt;
• and
• conveyance guides provided at both sides of said conveying belt in a widthwise direction thereof so as to guide said recording medium, the conveying belt being formed narrower than said recording medium.

A conveyance control device controlling a recording-medium conveying device conveying a recording medium to an image recording part, the recording medium being separated and fed from a recording-medium feeding device by a separating unit thereof, the recording-medium conveying device including:

• a conveying belt wound around a driving roller and a driven roller so as to convey said recording medium to said image recording part, the conveying belt having a two-layer structure composed of an insulating layer formed at one side contacting said recording medium and a conductive layer formed at the other side not contacting said recording medium;
• a belt charging unit provided in contact with said insulating layer in a vicinity of said separating unit so as to charge said insulating layer with a positive charge and a negative charge alternately in a moving direction of said conveying belt by applying an AC bias to said conveying belt;
• and
• a pressing roller pressing said conveying belt against said driving roller by exerting an elastic force so as to prevent said conveying belt from slipping on said driving roller,
• the conveyance control device comprising:
• a binary scale provided on a part of said conveying belt along the moving direction thereof,
• wherein one of a reflected light and a transmitted light from said binary scale is detected so as to control a revolving velocity and a stopping position of said driving roller, and
• a first length of a path along which the recording medium travels after being separated by the separating unit and until the recording medium contacts the conveying belt is greater than a second length along the conveying belt from a position of the belt charging unit to a position at which the recording medium contacts the conveying belt.

A conveyance control device controlling a recording-medium conveying device conveying a recording medium to an image recording part the recording medium being separated and fed from a recording-medium feeding device by a separating unit thereof, the recording-medium conveying device including:

• a conveying belt wound around a central part of a driving roller and a central part of a driven roller so as to convey said recording medium to said image recording part, the conveying belt being narrower than said recording medium, and having a two-layer structure composed of an insulating layer formed at one side contacting said recording medium and a conductive layer formed at the other side not contacting said recording medium;
• conveyance guides provided at both sides of said conveying belt in a widthwise direction thereof in said image recording part, the conveyance guides having a plurality of ribs and recession grooves alternately, each of said ribs and said recession grooves being aligned along a conveying direction of said recording medium;
• a belt charging unit provided in contact with said insulating layer in a vicinity of said separating unit so as to charge said insulating layer with a positive charge and a negative charge alternately in a moving direction of said conveying belt by applying an AC bias to said conveying belt;
• and
• a pressing roller pressing said conveying belt against said driving roller by exerting an elastic force so as to prevent said conveying belt from slipping on said driving roller,
• the conveyance control device comprising:
• a binary scale provided on a part of said conveying belt along the moving direction thereof,
• wherein one of a reflected light and a transmitted light from said binary scale is detected so as to control a revolving velocity and a stopping position of said driving roller.

A conveyance control device controlling a recording-medium conveying device conveying a recording medium to an image recording part, the recording medium being separated and fed from a recording-medium feeding device, the recording-medium conveying device including:

• a conveying belt wound around a driving roller and a driven roller so as to convey said recording medium to said image recording part, the conveying belt having an insulating layer formed at at least a side contacting said recording medium;
• and
• a belt charging unit provided in contact with said conveying belt and in a vicinity of a separating unit so as to charge said conveying belt with a positive charge and a negative charge alternately in a moving direction of said conveying belt by applying an AC bias to said conveying belt,
• the conveyance control device comprising:
• a conveyance distance detecting unit detecting one of a conveyance speed and a conveyance distance of said conveying belt;
• and
• a conveying-belt driving unit driving said driving roller,
• wherein said conveying-belt driving unit is controlled according to one of said conveyance speed and said conveyance distance detected by said conveyance distance detecting unit, and
• a first length of a path along which the recording medium travels after being separated by the separating unit and until the recording medium contacts the conveying belt is greater than a second length along the conveying belt from a position of the belt charging unit to a position at which the recording medium contacts the conveying belt.

A conveyance control device controlling a recording-medium conveying device conveying a recording medium to an image recording part, the recording medium being separated and fed from a recording-medium feeding device, the recording-medium conveying device including:

• a conveying belt wound around a driving roller and a driven roller so as to convey said recording medium to said image recording part, the conveying belt having an insulating layer formed at at least a side contacting said recording medium;
• and
• a belt charging unit provided in contact with said conveying belt and in a vicinity of a separating unit so as to charge said conveying belt with a positive charge and a negative charge alternately in a moving direction of said conveying belt by applying an AC bias to said conveying belt,
• the conveyance control device comprising:
• a conveyance distance detecting unit detecting one of a conveyance speed and a conveyance distance of said conveying belt;
• and
• a conveying-belt driving unit driving said driving roller,
• wherein said conveying-belt driving unit is controlled according to one of said conveyance speed and said conveyance distance detected by said conveyance distance detecting unit,
• wherein said conveyance distance detecting unit comprises:
• a binary scale provided on one of an outer surface and an inner surface of said conveying belt;
• and
• a read sensor reading said binary scale,
• wherein said binary scale has pitches arranged at an interval corresponding to a value obtained by dividing a maximum resolution of an image to be recorded on said recording medium by n, where n is an integer larger than zero.

A conveyance control device controlling a recording-medium conveying device conveying a recording medium to an image recording part, the recording medium being separated and fed from a recording-medium feeding device, the recording-medium conveying device including:

• a conveying belt wound around a driving roller and a driven roller so as to convey said recording medium to said image recording part, the conveying belt having an insulating layer formed at at least a side contacting said recording medium;
• and
• a belt charging unit provided in contact with said conveying belt and in a vicinity of a separating unit so as to charge said conveying belt with a positive charge and a negative charge alternately in a moving direction of said conveying belt by applying an AC bias to said conveying belt,
• the conveyance control device comprising:
• a conveyance distance detecting unit detecting one of a conveyance speed and a conveyance distance of said conveying belt;
• and
• a conveying-belt driving unit driving said driving roller,
• wherein said conveying-belt driving unit is controlled according to one of said conveyance speed and said conveyance distance detected by said conveyance distance detecting unit,
• wherein said conveyance distance detecting unit comprises an encoder provided on a rotary shaft of said driving roller,
• wherein said driving roller has a diameter determined such that a conveyance distance of said conveying belt corresponding to one pulse output by said encoder becomes a value obtained by dividing a maximum resolution of an image to be recorded on said recording medium by n, where n is an integer larger than zero.

An inkjet recording device comprising:

• a recording head in an image recording part so as to record an image by jetting ink drops on a recording medium;
• a recording-medium feeding device containing said recording medium, and separating and feeding said recording medium one by one therefrom;
• and
• a recording-medium conveying device including:
• a conveying belt wound around a driving roller and a driven roller so as to convey said recording medium to said image recording part, the conveying belt having an insulating layer formed at at least a side contacting said recording medium;
• and
• a belt charging unit provided in contact with said conveying belt and in a vicinity of a separating unit so as to charge said conveying belt with a positive charge and a negative charge alternately in a moving direction of said conveying belt by applying an AC bias to said conveying belt,
• wherein a first length of a path along which the recording medium travels after being separated by the separating unit and until the recording medium contacts the conveying belt is greater than a second length along the conveying belt from a position of the belt charging unit to a position at which the recording medium contacts the conveying belt.

An inkjet recording device comprising:

• a recording head mounted on a carriage in an image recording part so as to record an image by jetting ink drops on a recording medium;
• a recording-medium feeding device containing said recording medium, and separating and feeding said recording medium one by one therefrom;
• and
• a recording-medium conveying device including:
• a conveying belt wound around a driving roller and a driven roller so as to convey said recording medium to said image recording part, the conveying belt having an insulating layer formed at at least a side contacting said recording medium;
• and
• a belt charging unit provided in contact with said conveying belt and in a vicinity of a separating unit so as to charge said conveying belt with a positive charge and a negative charge alternately in a moving direction of said conveying belt by applying an AC bias to said conveying belt,
• wherein a first length of a path along which the recording medium travels after being separated by the separating unit and until the recording medium contacts the conveying belt is greater than a second length along the conveying belt from a position of the belt charging unit to a position at which the recording medium contacts the conveying belt.

An inkjet recording device comprising:

• a recording head mounted on a carnage in an image recording part so as to record an image by jetting ink drops on a recording medium;
• a recording-medium feeding device containing said recording medium, and separating and feeding said recording medium one by one therefrom by a separating unit thereof;
• and
• a recording-medium conveying device including:
• a conveying belt wound around a driving roller and a driven roller so as to convey said recording medium to said image recording part, the conveying belt having a two-layer structure composed of an insulating layer formed at one side contacting said recording medium and a conductive layer formed at the other side not contacting said recording medium;
• a belt charging unit provided in contact with said insulating layer in a vicinity of said separating unit so as to charge said insulating layer with a positive charge and a negative charge alternately in a moving direction of said conveying belt by applying an AC bias to said conveying belt;
• and
• a pressing roller pressing said conveying belt against said driving roller by exerting an elastic force so as to prevent said conveying belt from slipping on said driving roller,
• wherein a first length of a path along which the recording medium travels after being separated by the separating unit and until the recording medium contacts the conveying belt is greater than a second length along the conveying belt from a position of the belt charging unit to a position at which the recording medium contacts the conveying belt.

An inkjet recording device comprising:

• a recording head mounted on a carriage in an image recording part so as to record an image by jetting ink drops on a recording medium;
• a recording-medium feeding device containing said recording medium, and separating and feeding said recording medium one by one therefrom by a separating unit thereof;
• and
• a recording-medium conveying device including:
• a conveying belt wound around a central part of a driving roller and a central part of a driven roller so as to convey said recording medium to said image recording part, the conveying belt being narrower than said recording medium, and having a two-layer structure composed of an insulating layer formed at one side contacting said recording medium and a conductive layer formed at the other side not contacting said recording medium;
• conveyance guides provided at both sides of said conveying belt in a widthwise direction thereof in said image recording part, the conveyance guides having a plurality of ribs and recession grooves alternately, each of said ribs and said recession grooves being aligned along a conveying direction of said recording medium;
• a belt charging unit provided in contact with said insulating layer in a vicinity of said separating unit so as to charge said insulating layer with a positive charge and a negative charge alternately in a moving direction of said conveying belt by applying an AC bias to said conveying belt;
• and
• a pressing roller pressing said conveying belt against said driving roller by exerting an elastic force so as to prevent said conveying belt from slipping on said driving roller.

An inkjet recording device comprising:

• a recording head mounted on a carriage in an image recording part so as to record an image by jetting ink drops on a recording medium;
• a recording-medium feeding device containing said recording medium, and separating and feeding said recording medium one by one therefrom by a separating unit thereof;
• and
• a recording-medium conveying device including:
• a conveying belt wound around a central part of a driving roller and a central part of a driven roller so as to convey said recording medium to said image recording part, the conveying belt being narrower than said recording medium, and having a two-layer structure composed of an insulating layer formed at one side contacting said recording medium and a conductive layer formed at the other side not contacting said recording medium;
• conveyance guides provided at both sides of said conveying belt in a widthwise direction thereof in said image recording part, the conveyance guides having a plurality of ribs and recession grooves alternately, each of said ribs and said recession grooves being aligned along a conveying direction of said recording medium;
• and
• a belt charging unit provided in contact with said insulating layer in a vicinity of said separating unit so as to charge said insulating layer with a positive charge and a negative charge alternately in a moving direction of said conveying belt by applying an AC bias to said conveying belt,
• wherein at least one of said driving roller and said driven roller is a grip roller having a plurality of projections.

An inkjet recording device comprising:

• a recording head mounted on a carriage in an image recording part so as to record an image by jetting ink drops on a recording medium;
• a recording-medium feeding device containing said recording medium, and separating and feeding said recording medium one by one therefrom by a separating unit thereof;
• and
• a recording-medium conveying device including:
• a conveying belt wound around a driving roller and a driven roller so as to convey said recording medium to said image recording part, the conveying belt having a two-layer structure composed of an insulating layer formed at one side contacting said recording medium and a timing belt formed by a conductive layer at the other side not contacting said recording medium;
• and
• a belt charging unit provided in contact with said insulating layer in a vicinity of said separating unit so as to charge said insulating layer with a positive charge and a negative charge alternately in a moving direction of said conveying belt by applying an AC bias to said conveying belt,
• wherein a first length of a path along which the recording medium travels after being separated by the separating unit and until the recording medium contacts the conveying belt is greater than a second length along the conveying belt from a position of the belt charging unit to a position at which the recording medium contacts the conveying belt.

An inkjet recording device comprising:

• a recording head mounted on a carriage in an image recording part so as to record an image by jetting ink drops on a recording medium;
• a recording-medium feeding device containing said recording medium, and separating and feeding said recording medium one by one therefrom by a separating unit thereof;
• and
• a recording-medium conveying device including:
• a conveying belt wound around a central part of a driving roller and a central part of a driven roller so as to convey said recording medium to said image recording part, the conveying belt being narrower than said recording medium, and having a two-layer structure composed of an insulating layer formed at one side contacting said recording medium and a timing belt formed by a conductive layer at the other side not contacting said recording medium;
• and
• conveyance guides provided at both sides of said conveying belt in a widthwise direction thereof in said image recording part, the conveyance guides having a plurality of ribs and recession grooves alternately, each of said ribs and said recession grooves being aligned along a conveying direction of said recording medium;
• and
• a belt charging unit provided in contact with said insulating layer in a vicinity of said separating unit so as to charge said insulating layer with a positive charge and a negative charge alternately in a moving direction of said conveying belt by applying an AC bias to said conveying belt.

An inkjet recording device comprising:

• a recording head mounted on a carriage in an image recording part so as to record an image by jetting ink drops on a recording medium;
• a recording-medium feeding device containing said recording medium, and separating and feeding said recording medium one by one therefrom by a separating unit thereof;
• and
• a recording-medium conveying device including:
• a conveying belt wound around a driving roller and a driven roller so as to convey said recording medium to said image recording part, the conveying belt having a two-layer structure composed of an insulating layer formed at one side contacting said recording medium and a conductive layer formed at the other side not contacting said recording medium;
• a belt charging unit provided in contact with said insulating layer in a vicinity of said separating unit so as to charge said insulating layer with a positive charge and a negative charge alternately in a moving direction of said conveying belt by applying an AC bias to said conveying belt;
• and
• a pressing roller pressing said conveying belt against said driving roller by exerting an elastic force so as to prevent said conveying belt from slipping on said driving roller,
• wherein one of said driving roller and said driven roller positioned upstream in a conveying direction of said recording medium has a large diameter, and the other of said driving roller and said driven roller positioned downstream in the conveying direction of said recording medium has a small diameter.

An inkjet recording device comprising:

• a recording head mounted on a carriage in an image recording part so as to record an image by jetting ink drops on a recording medium;
• a recording-medium feeding device containing said recording medium, and separating and feeding said recording medium one by one therefrom;
• and
• a recording-medium conveying device including:
• a conveying belt wound around a driving roller and a driven roller, the driving roller being connected to a ground, so as to convey said recording medium to said image recording part, the conveying belt having an insulating layer formed at a side contacting said recording medium;
• a belt charging unit provided opposite said driving roller at a position upstream in a revolving direction of said driving roller from a position at which said recording medium fed from said recording-medium feeding device contacts said conveying belt wound around said driving roller so as to charge said conveying belt with a positive charge and a negative charge alternately in a moving direction of said conveying belt by applying an AC bias to said conveying belt;
• and
• a pressing roller provided opposite said driving roller at a position downstream in the revolving direction of said driving roller from said belt charging unit so as to press said recording medium stuck fast to said conveying belt closely to said conveying belt and so as to press said conveying belt against said driving roller,
• wherein a first length of a path along which the recording medium travels after being separated by the separating unit and until the recording medium contacts the conveying belt is greater than a second length along the conveying belt from a position of the belt charging unit to a position at which the recording medium contacts the conveying belt.

An inkjet recording device comprising:

• a recording head mounted on a carriage in an image recording part so as to record an image by jetting ink drops on a recording medium;
• a recording-medium feeding device containing said recording medium, and separating and feeding said recording medium one by one therefrom;
• and
• a recording-medium conveying device including:
• a conveying belt wound around a driving roller and a driven roller so as to convey said recording medium to said image recording part, the conveying belt having an insulating layer formed at at least a side contacting said recording medium;
• and
• a belt charging unit provided in contact with said conveying belt and in a vicinity of a separating unit so as to charge said conveying belt with a positive charge and a negative charge alternately in a moving direction of said conveying belt by applying an AC bias to said conveying belt,
• wherein said insulating layer has a volume resistivity equal to or more than 1012 Ωcm.

An inkjet recording device comprising:

• a recording head mounted on a carriage in an image recording part so as to record an image by jetting ink drops on a recording medium;
• a recording-medium feeding device containing said recording medium, and separating and feeding said recording medium one by one therefrom;
• and
• a recording-medium conveying device including:
• a conveying belt wound around a driving roller and a driven roller so as to convey said recording medium to said image recording part, the conveying belt having an insulating layer formed at at least a side contacting said recording medium;
• and
• a belt charging unit provided in contact with said conveying belt and in a vicinity of a separating unit so as to charge said conveying belt with a positive charge and a negative charge alternately in a moving direction of said conveying belt by applying an AC bias to said conveying belt,
• wherein said recording-medium conveying device further includes conveyance guides provided at both sides of said conveying belt in a widthwise direction thereof so as to guide said recording medium, the conveying belt being formed narrower than said recording medium.

An inkjet recording device comprising:

• a recording head mounted on a carriage in an image recording part so as to record an image by jetting ink drops on a recording medium;
• a recording-medium feeding device containing said recording medium, and separating and feeding said recording medium one by one therefrom;
• and
• a recording-medium conveying device including:
• a conveying belt wound around a driving roller and a driven roller so as to convey said recording medium to said image recording part, the conveying belt having an insulating layer formed at at least a side contacting said recording medium;
• and
• a belt charging unit provided in contact with said conveying belt and in a vicinity of a separating unit so as to charge said conveying belt with a positive charge and a negative charge alternately in a moving direction of said conveying belt by applying an AC bias to said conveying belt;
• and
• a conveyance distance detecting unit detecting one of a conveyance speed and a conveyance distance of said conveying belt;
• and
• a conveying-belt driving unit driving said driving roller,
• wherein said conveying-belt driving unit is controlled according to one of said conveyance speed and said conveyance distance detected by said conveyance distance detecting unit,
• wherein said conveyance distance detecting unit comprises:
• a binary scale provided on one of an outer surface and an inner surface of said conveying belt;
• and
• a read sensor reading said binary scale,
• wherein said binary scale has pitches arranged at an interval corresponding to a value obtained by dividing a maximum resolution of an image to be recorded on said recording medium by n, where n is an integer larger than zero.

An inkjet recording device comprising:

• a recording head mounted on a carnage in an image recording part so as to record an image by jetting ink drops on a recording medium;
• a recording-medium feeding device containing said recording medium, and separating and feeding said recording medium one by one therefrom;
• and
• a recording-medium conveying device including:
• a conveying belt wound around a driving roller and a driven roller so as to convey said recording medium to said image recording part, the conveying belt having an insulating layer formed at at least a side contacting said recording medium;
• and
• a belt charging unit provided in contact with said conveying belt and in a vicinity of a separating unit so as to charge said conveying belt with a positive charge and a negative charge alternately in a moving direction of said conveying belt by applying an AC bias to said conveying belt;
• and
• a conveyance distance detecting unit detecting one of a conveyance speed and a conveyance distance of said conveying belt;
• and
• a conveying-belt driving unit driving said driving roller,
• wherein said conveying-belt driving wilt is controlled according to one of said conveyance speed and said conveyance distance detected by said conveyance distance detecting unit,
• wherein said conveyance distance detecting unit comprises an encoder provided on a rotary shaft of said driving roller,
• wherein said driving roller has a diameter determined such that a conveyance distance of said conveying belt corresponding to one pulse output by said encoder becomes a value obtained by dividing a maximum resolution of an image to be recorded on said recording medium by n, where n is an integer larger than zero.