| 摘要 |
<p>A running web cutting device in which a vertically movable cutter is driven by a crank mechanism. A reciprocating stand holding an upper cutting edge and lower cutting edge is provided in such a manner to be moved in the direction of advancement of a web by a reciprocating guide. The upper and lower cutting edges are driven through the same crank shaft coupled to a cutter driving motor. A value J (J=J Wo/To where J is the conversion inertial moment of a driving motor including a load, Wo is the rated speed thereof, and To is the rated torque thereof) of said cutter driving motor is represented by JC while a value J of a web feeding motor driving a web feeding drum is represented by JF. The cutter driving motor and the web feeding motor are chosen so that JC smaller than JF. Pulse generators are coupled to the web feeding motor and the cutter driving motor, respectively, and a pulse thinning-out circuit for controlling a movement speed, in the direction of advancement of said web, of said cutter is provided in a control circuit of the cutter driving motor.</p> |
