Riso Kagaku Corporation

Naoyuki Iimura

Hideharu Yoneoka

A backlash correction device of this invention has a motor, a gear transmitting a moving force from the motor to a paper feed base, a spring urging the paper feed base to one of forward and backward movement directions of the paper feed base using an urging force, and a controller. (1) If the paper feed base is moved in an opposite direction to an urging direction of the spring, the controller drives the motor in a movement direction of the paper feed base by a predetermined movement quantity. (2) If the paper feed base is moved in a same direction as the urging direction of the spring, the controller (2-1) drives the motor in a movement direction of the paper feed base by a movement quantity which is the sum of the predetermined movement quantity and a correction quantity equal to or greater than a maximum backlash quantity, and (2-2) then drives the motor in an opposite direction by the correction quantity.

Backlash correction device and backlash correction method

In a printing machine, a tip end of a print sheet , which is transferred from a paper feed section synchronously with rotation of a printing drum and a pressure drum , is clamped by a sheet clamp section at a rotation clamp position upstream of a press portion on which the printing drum and the pressure drum press each other. The print sheet thus clamped is transferred along an outer peripheral surface of the pressure drum and pressed against a stencil sheet on the press portion. Then, printing is done. The printing machine is provided with a sheet clamp guide member guiding the tip end of the print sheet , which is transferred from the sheet feed section , to a position on which the print sheet is abutted on a sheet abutment face of the sheet clamp section located at the rotation clamp position.

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Ibaraki-ken, Japan

Naoyuki Iimura