Shredder drive control device and method of drivingly controlling the shredder

A shredder for shredding paper sheets, comprising:

• a shredding mechanism for shredding paper sheets;
• a motor for driving the shredding mechanism;
• and
• a control means interposed between the motor and a commercial power supply system to control power to be supplied to the motor;
• wherein the motor has a characteristic to reduce motor torque substantially linearly with the increase of operating speed for voltage applied thereto as a parameter, and
• the control means controls the motor so that operating speed of the motor decreases as a necessary torque of the shredding mechanism required for shredding paper sheets increases, and the power supplied from the commercial power supply system may not increase beyond a predetermined level.

A driving and controlling method of driving and controlling a shredder for shredding paper sheets by means of a driving and controlling system for driving and controlling the shredder;

• wherein the driving and controlling system comprises:
• a motor for driving a shredding mechanism for shredding paper sheets;
• a control means interposed between the motor and a commercial power supply system to control power supplied to the motor;
• and
• the motor has a characteristic to reduce motor torque substantially linearly with the increase of operating speed for voltage applied thereto as a parameter, and
• wherein the driving and controlling method comprises:
• controlling the motor by the control means so that the operating speed of the motor decreases as a necessary torque of the shredding mechanism required for shredding paper sheets increases, and the power supplied from the commercial power supply system does not increase beyond a predetermined level.