Speed control system for a corrugator

A speed control for a system having at least first and second motors operatively associated with each other, comprising:

• digital means for automatically generating a preselected digital set point signal indicative of a preselected minimum speed for said first motor;
• digital means for generating first and second digital set point signals indicative of first and second speeds for said first motor, said first and second speeds being not less than said preselected minimum speed;
• digital means for selectively storing said first digital set point signal while the speed of said first motor is varied from said first speed;
• means for automatically bringing the first motor speed up to said preselected minimum speed in response to said preselected digital set point signal and for varying the speed of said first motor between said first and second speeds in response to said first and second digital set point signals;
• and
• means for automatically restoring the first motor speed to said first speed from said second speed in response to said stored first set point signal,

An improved speed control for a corrugator having at least one single facer machine operatively associated with a double facer machine, each of said machines including a motor, comprising:

• a pulse generator;
• means for activating said pulse generator;
• digital counting means responsive to said pulse generator for generating digital set point signals representative of a preselected minimum speed to which the single facer motor is to be driven, a preselected maximum speed beyond which the single facer motor is not to be driven, and first and second speeds not less than said preselected minimum speed between which the single facer motor speed is to be varied;
• means for driving the single facer motor in response to at least one of said digital set point signals;
• means for digitally detecting said digital set point signals representative of said preselected minimum speed and said preselected maximum speed;
• digital means for inhibiting said pulse generator in response to said detecting means detecting said digital set point signal representative of said preselected minimum speed to prevent said single facer motor from being driven below said preselected minimum speed;
• digital means for inhibiting said pulse generator in response to said detecting means detecting said digital set point signal representative of said preselected maximum speed to prevent said single facer motor from being driven above said preselected maximum speed;
• digital means for temporarily storing said digital set point signal representative of said first speed from which said single facer motor speed is varied;
• digital means for retrieving said stored set point signal;
• and
• digital means for applying the retrieved set point signal to said driving means to restore said single facer motor speed to said first speed.

An improved speed control for a corrugator having at least a single facer machine operatively associated with a double facer machine, each of said machines including a motor, comprising:

• digital means for automatically generating a preselected digital set point signal indicative of a preselected minimum speed for the single facer motor;
• digital means for selectively generating first and second selective digital set point signals respectively indicative of first and second selective speeds for said single facer motor;
• and
• means for bringing the speed of said single facer motor up to said preselected minimum speed in response to said preselected digital set point signal and for varying the speed of the single facer motor between said first and second selective speeds in response to said first and second selective set point signals.

An improved speed control for a corrugator having at least one single facer machine operatively associated with a double facer machine, each of said machines including a motor, comprising:

• digital means for automatically generating a preselected digital set point signal indicative of a preselected minimum speed for the double facer machine motor;
• digital means for generating first and second digital set point signals indicative of first and second speeds for said double facer machine motor, said first and second speeds being not less than said preselected minimum speed;
• digital means for selectively storing said first digital set point signal while the speed of the double facer machine motor is varied;
• means for automatically bringing the double facer machine motor speed up to said preselected minimum speed in response to said preselected digital set point signal and for varying the speed of the double facer machine motor between said first and second speeds in response to said first and second digital set point signals;
• and
• means for automatically restoring the double facer machine motor speed to said first speed in response to said stored digital set point signal.

An improved speed control for a corrugator having at least one single facer machine operatively associated with a double facer machine, each of said machines including a motor and means for driving the motor in response to set point signals representative of desired motor speeds, comprising:

• digital means for automatically generating a preselected digital set point signal indicative of a preselected minimum speed for the single facer machine motor;
• digital means for generating first and second digital set point signals indicative of first and second speeds for said single facer machine motor, said first and second speeds being not less than said preselected minimum speed;
• digital means for selectively storing said first digital set point signal while the speed of the single facer machine motor is varied;
• and
• means for separately applying said preselected minimum speed set point signal, said first and second set point signals, and said stored set point signal to the means for driving the single facer machine motor to cause said single facer machine motor speed to reach said preselected minimum speed, vary between said first and second speeds and return to said stored first speed, respectively.