Cutting control apparatus

A cutting control apparatus for cutting, by a rotary type flying cutter, a sheet, pipe or like material fed by a feeder, comprising:

• a reference speed signal generator for dividing a travelling speed signal of the material by a synchronous cutting length corresponding to setting of a blade speed change mechanism of the rotary type flying cutter;
• a motor supplied with the divided output as a reference speed signal to drive the blade of the rotary type flying cutter;
• a length-measuring encoder for generating length-measuring pulses corresponding in number to the length of the material being fed;
• a rotation detecting encoder for generating rotation pulses corresponding in number to the rotation of the motor;
• an adder supplied with an additive input that the length-measuring pulse is multiplied by a constant coefficient and a subtractive input that the rotation pulse is multiplied by the synchronous cutting length;
• an arithmetic circuit for performing an operation of a correction value on the basis of a set cutting length and the synchronous cutting length and applying the correction value to the adder for each cutting;
• and
• a D-A converter for converting the output from the adder into an analog signal and using it as a correction signal for the reference speed signal.

A cutting control apparatus for cutting, by a rotary type flying cutter, a sheet, pipe or like material fed by a feeder, comprising:

• a reference speed signal generator for multiplying a speed signal of a motor for driving the blade of the rotary type flying cutter, by a synchronous cutting length corresponding to setting of a blade speed change mechanism of the rotary type flying cutter;
• a motor supplied with the multiplied output as a reference speed signal to feed the material;
• a length-measuring encoder for generating length-measuring pulses corresponding in number to the rotation of the motor for feeding the material;
• a rotation detecting encoder for generating rotation pulses corresponding in number to the rotation of a motor for driving the blade of the cutter;
• an adder supplied with a subtractive input that the length-measuring pulse is mutiplied by a constant coefficient and an additive input that the rotation pulse is multiplied by a coefficient proportional to the synchronous cutting length;
• an arithmetic circuit for performing an operation of a correction value on the basis of a set cutting length and the synchronous cutting length and applying the correction value to the adder for each cutting;
• and
• a D-A converter for converting the output from the adder into an analog signal and using it as a correction signal for the reference speed signal.