Riso Kagaku Corporation

Weihua Xu

Yoshikazu Hara

Hisashi Sanagi

In the device for automatically controlling the position of a pair of pinch rollers for pressing opposite side edge portions of a sheet delivered from a printing portion of a printer at a surface thereof bearing a print image according to a detection of the spacing between a pair of side fences for aligning opposite sides edges of a stack of sheets charged on a sheet supply tray, a detection error of the sheet width due to a disturbance of stack condition of the sheets or an incorrect contact of the side fence to the side edge of the stack of sheets is automatically corrected by the spacing between the pair of side fences being compared with the width of sheets of regular sizes, while the pinch rollers being positioned by assuming that the sheets are of one of the regular sizes when the difference of the comparison is within a predetermined numerical range.

Sheet supply and transfer device for printers presumable of sheet size

The barrier wall device for paper sheets flying thereto with one edge posing as a front edge as discharged from a printing portion of a copying or printing machine to collide thereagainst is constructed to have a barrier wall plate elastically supported from a frame body by an elastic tensile support device extending perpendicularly to the direction of fly coming of the paper sheets, so that the barrier wall plate is biased in parallelism by expanding and inclining the tensile support device. The paper sheet receptacle is desirably adaptable to a high speed copying or printing machine so that paper sheet collision noise is lowered, with paper sheets received to form a well trued stack.

Growing community of inventors

Ibaraki-ken, Japan

Weihua Xu