Machine tool control system

Claim 2

In a control system: a first means for providing information to impart machine movement at a programmed rate; a second means coupled to said first means for providing rate changes of the movement in the machine axis; a first counter for receiving a predetermined number of pulses indicative of the information provided by said first means; a second counter for receiving a number of pulses indicative of the rate change provided by said second means; and means for deleting the number of pulses in said second counter from the contents of said first counter at predetermined intervals, said means being coupled to said first and said second counters.

Claim 3

A machine tool control system for providing manual intervention override means to change a programmed rate of change comprising: a time ramp generator having an input circuit and an output circuit, means coupled to said input circuit for providing timing signals to said time ramp generator; a feed rate override means for providing signal changes, said feed rate override means having an input circuit coupled to the output circuit of said time ramp generator; a voltage offset generator having an input circuit coupled to the output circuit of said feed rate override and having an output circuit, said voltage offset generator including means for providing a change of zero reference of the signal provided to the input means of said time ramp generator; a comparator, said comparator having a first input circuit coupled to the output circuit of said voltage offset generator and a second input circuit and having an output circuit; a flip-flop, said flip-flop having a first input coupled to the output of said comparator and a second input, said flip-flop having a first output circuit and a second output circuit; a constant current generator having an output circuit coupled to the second input circuit of said comparator and an input circuit coupled to the first output circuit of said flip-flop; logic means enabled by said second output circuit of said flip-flop and providing output signals for a predetermined time, said logic le means including a digit counter capable of providing output signals indicative of the programmed input and further including a clock circuit which provides clock signals at the rate of the programmed input; and counting circuits enabled by said logic means and providing a first output to the second input circuit of said flip-flop and a second output circuit for providing output signals dictated by the output of said feed rate override means.

Claim 4

A machine tool control system for providing manual intervention override means to change a programmed rate of change comprising: a time ramp generator having an input circuit and an output circuit, means coupled to said input circuit for providing timing signals to said time ramp generator; a feed rate override means for providing signal changes, said feed rate override means having an input circuit coupled to the output circuit of said time ramp generator; a voltage offset generator having an input circuit coupled to the output circuit of said feed rate override and having an output circuit, said voltage offset generator including means for providing a change of zero reference of the signal provided to the input means of said time ramp generator; a comparator, said comparator having a first input circuit coupled to the output circuit of said voltage offset generator and a second input circuit and having an output circuit; a flip-flop, said flip-flop having a first input coupled to the output of said comparator and a second input, said flip-flop having a first output circuit and a second output circuit; a constant current generator having an output circuit coupled to the second input circuit of said comparator and an input circuit coupled to the first output circuit of said flip-flop; logic means enabled by said second output circuit of said flip-flop and providing output signals for a predetermined time, said logic le means including a digit counter capable of providing output signals indicative of the programmed input and further including a clock circuit which provides clock signals at the rate of the programmed input; and counting circuits enabled by said logic means and providing a first output to the second input circuit of said flip-flop and a second output circuit for providing output signals dictated by the output of said feed rate override means.

Claim 5

The control system as defined in claim 2 and wherein said counting circuits comprise: a first binary counter responsive to the programmed input signals of said logic means; a second binary counter being responsive to the output signal of predetermined times of said logic means; and further logic means being coupled to said first and said second binary counters for deleting the contents of said first counter from said second counter at predetermined intervals.

Claim 6

In a machine tool control system: means for providing an information signal having a voltage level of a predetermined amplitude; a voltage-to-time period converter; a time period-to-pulse infOrmation converter responsive to said voltage-to-time period converter; means coupled to said time period-to-pulse information converter for sampling the pulses provided thereby; logic means coupled to said sampling means for determining a voltage level of a different amplitude; a first counter for receiving the pulses indicative of the information signal of said first means; a second counter for receiving the sampled pulse of said second means; and means for deleting the number of sampled pulses of said second means from the contents of said second counter.

Claim 7

In a machine tool control system: means for providing an information signal having a voltage level of a predetermined amplitude; a voltage-to-time period converter; a time period-to-pulse infOrmation converter responsive to said voltage-to-time period converter; means coupled to said time period-to-pulse information converter for sampling the pulses provided thereby; logic means coupled to said sampling means for determining a voltage level of a different amplitude; a first counter for receiving the pulses indicative of the information signal of said first means; a second counter for receiving the sampled pulse of said second means; and means for deleting the number of sampled pulses of said second means from the contents of said second counter.

Claim 8

The control system as defined in claim 4 wherein said voltage to time period converter includes: a time ramp generator being responsive to said first named means for generating a signal at predetermined times in relation thereto and having a determinable rise and fall time; an override circuit coupled to said time ramp generator and including a control to vary the voltage level of the signals; a feedback network including a constant current source; a comparator being responsive to said time ramp generator and said feedback network; and a detector circuit being coupled to said feedback network and responsive to said comparator.

Claim 9

The control system as defined in claim 4 wherein said voltage to time period converter comprises: a time ramp generator being responsive to said first named means for generating a signal at a predetermined time in relation thereto and having a determinable rise and fall time; an override circuit coupled to said time ramp generator and including a control means for varying the voltage level of the signals; a feedback network including a constant current source; a comparator being responsive to said time ramp generator and said feedback network; a first detection circuit being coupled to said feedback network and responsive to said comparator and wherein said time period to pulse information converter comprises; a clock pulse generator; a second detection circuit being responsive to signals from said clock pulse generator and said voltage to time converter; and logic means coupled to said clock pulse generator and said second detection circuit for providing output pulses indicative of the time period provided by the information signal of said first named means.

Claim 10

A machine tool control system having a feed rate generator comprising: a signal source having an output circuit; a time ramp generator having an input circuit coupled to said output circuit of said signal source and having an output circuit; a constant signal source having an input circuit and having an output circuit; a comparator having a first input circuit coupled to said output circuit of said time ram generator and having a second input circuit coupled to the output circuit of said constant signal source; a detector circuit having an input circuit coupled to said output circuit of said comparator and having an output circuit coupled to said input circuit of said constant current source; a divider network responsive to said detector circuit and having a first counting circuit and a second counting circuit, said first counting circuit being coupled to said comparator and said second counting circuit being coupled to said detector circuit; and a gating circuit coupled to and controlled by said first counter and said second counter for producing an output pulse train indicative of feed rate.

Claim 11

A machine tool control system having a feed rate generator comprising: a signal source having an output circuit; a time ramp generator having an input circuit coupled to said output circuit of said signal source and having an output circuit; a constant signal source having an input circuit and having an output circuit; a comparator having a first input circuit coupled to said output circuit of said time ram generator and having a second input circuit coupled to the output circuit of said constant signal source; a detector circuit having an input circuit coupled to said output circuit of said comparator and having an output circuit coupled to said input circuit of said constant current source; a divider network responsive to said detector circuit and having a first counting circuit and a second counting circuit, said first counting circuit being coupled to said comparator and said second counting circuit being coupled to said detector circuit; and a gating circuit coupled to and controlled by said first counter and said second counter for producing an output pulse train indicative of feed rate.