Apparatus for producing simplex of duplex copies

In apparatus for producing images on one or both sides of a copy sheet having first and second sides, said apparatus including a movable image transfer member, means for forming unfixed transferable images on said image transfer member and first and second image transfer means for transferring said images from said transfer member to a copy sheet, the improvement comprising,

• vacuum member means which is located adjacent to said image transfer member between said first and second image transfer means and which is movable in first and second opposite directions for operating in synchronism with said movable image transfer member;
• in a duplex mode wherein said vacuum member means is moved in said first direction to separate by vacuum attraction from transfer relationship with said transfer member a copy sheet to a side of which a first transferable image has been transferred by said first image transfer means and in said second direction after said copy sheet has been separated from said transfer member to invert said copy sheet while said first image is unfixed to bring the second side of said copy sheet into transfer relationship with a second image on said transfer member at said second image transfer meas;
• and
• in a simplex mode wherein said vacuum member means is moved in the second direction to bring the first side of a copy sheet into transfer relationship with a first transferable image on said transfer member at said second transfer station.

Apparatus for producing images on one or both sides of a copy sheet, comprising:

• a movable image transfer member;
• image forming means for forming transferable images on said image transfer member;
• first and second image transfer means for transferring said images from said transfer member to a copy sheet;
• supply means for supplying copy sheets having first and second sides into transfer relationship with said image transfer member;
• a vacuum member which is located adjacent to said image transfer member between said first and second image transfer transfer means and which is movable in first and second opposite directions;
• and
• means operatively associated with said image forming means, said supply means and said vacuum member for synchronizing the operation thereof;
• in a duplex mode to cause said image forming means to form first and second transferable images on said image transfer member, said supply means to supply a copy sheet into transfer relationship with said first image on said image transfer member at said first transfer means and said vacuum member to move in a first direction to separate said copy sheet to which said first image has been transferred to the first side thereof, out of transfer relationship with said transfer member and to move said vacuum member in a second opposite direction after said copy sheet has been separated from said transfer member to invert said copy sheet while said first image is unfixed and to bring the second side of said copy sheet into transfer relationship with the second transferable image on said transfer member at said second transfer means;
• and
• in a simplex mode to cause said image forming means to form a first transferable image on said image transfer member, said vacuum member to move in the second direction, and said supply means to supply a copy sheet into contact with said vacuum member so as to move said copy sheet into transfer relationship with the first transferable image on said transfer member at said second transfer means.

In a copier for producing simplex or duplex copies including a movable image transfer member upon which transferable images may be formed, first and second image transfer stations located adjacent said image transfer member and a vacuum member movable in first and second opposite directions located adjacent said image transfer member between said first and second image transfer stations, improved copy sheet handling apparatus comprising:

• a supply for copy sheets;
• means defining a first copy sheet path for supplying a copy sheet from said supply into image transfer relationship with said image transfer member at said first transfer station when a duplex copy is made;
• and
• means defining a second copy sheet path including said vacuum member for supplying a copy sheet from said supply into image transfer relationship with said image transfer member at said second transfer station when a simplex copy is made.