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US 3,933,065 AGranted
Fluidic machine cycle control
AssigneeJohnson Service Company
InventorsGeorge J. Janu, Donn R. Fischer
Life of this patent
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AssigneeJohnson Service Company
InventorsGeorge J. Janu, Donn R. Fischer
Estimating the term…
A press control includes a pair of pushbuttons each operating a pneumatic pump means to form a pair of signal pulses and an integrated valve to form a pair of binary logic pressure signals. A press position sensor provides a binary pressure signal related to the press position. The pushbutton and sensor signals are connected to fluidic logic gate means to compare and detect the actuation of the pushbuttons as well as the status of such pushbuttons and the press cycle. The logic output is connected by a plurality of logic gates to actuate a flip-flop output unit to generate an extend output or a retract output. The flip-flop output unit has an input connected to a latch input control to provide automatic reset to the retract output if release of the button signal sources occurs during a hazardous portion of the extend cycle. Once the non-hazardous portion of the extend cycle is reached, the latch is complete for the terminal portion of the extend cycle. A fluidic fuse in the form of a diaphragm comparator monitors the extend output and the operation of the pushbuttons and automatically responds to terminate press operation if the logic signal outputs of the pusbuttons are not formed prior to creation of the extend signal. After creating of the extend cycle, a special bleed system permits release of the pushbuttons after the hazardous portion of the extend cycle is complete.
A fluid machine control apparatus for a movable working element of a machine comprising a plurality of manually operable fluid signal source means having a first position and operable to a second position, each of said source means generating a plurality of unique fluid signals in response to the movement from the first to the second position to monitor the actuation thereof and the setting of said source means to said second position, sensor means for monitoring the position of the working element and producing a machine position related fluid output signal, a fluid signal logic processing means including fluid signal comparator means including first monitor means monitoring the operation of the source means and the sensor and responsive to simultaneous generation of signals of the source means and the output of the sensor to produce a control output to selectively enable the operation of the machine and second monitoring means monitoring the setting of the source means to the second position and the sensor means to selectively disable the machine in response to movement from said second position.
A fluid machine control apparatus for controlling the cyclical operation of a moving element of a machine comprising a pair of manually operable fluid signal source means having a first position and operable to a second position, each of said source means generating a first pulse signal in response to the movement from the first to the second position and a second binary signal in response to setting of said second position, a sensor means for monitoring the position of a moving element of the machine and producing a machine position fluid output signal, a bi-stable switch means connected to control operation of the machine, a signal logic processing means including first and second comparator means monitoring the operation of the source means and the sensor, said first comparator means being responsive only to simultaneous generation of the first pulse signals and the output of the sensor to produce an enable set signal to the bi-stable switch means, and said second comparator means being responsive to the second binary signals and the output of the sensor and the bi-stable switch means to reset the switch means if the secondary binary signal is removed during a selected portion of the machine cycle.
A fluid machine control apparatus for a machine having a cyclically moving work element moving through a hazardous portion and a non-hazardous portion in each cycle, comprising a fluid sensor establishing a signal stream selectively interrupted by said machine to produce a binary logic signal, a pair of signal generators each having a manually operable control element, each of said signal generators including a pulse forming means and a binary signal forming means, a bi-stable fluid switch means establishing a first extend signal output and a second retract signal output, said extend and retract outputs being opposite binary signals, first and second logic coupling means having interconnected inputs and connected to provide binary output signals, the outputs of the coupling means being connected to inputs of the bi-stable fluid switch means, feedback means connected between the outputs of the bi-stable switch means and the inputs of the coupling means, a first signal combining logic means having a plurality of inputs connected to the pulse means of said generators and to the position sensor and to the extend signal output and having an output connected to the interconnected inputs of said coupling means to set the bi-stable switch means, a second signal combining logic means having a plurality of inputs connected to the position sensor and to the binary signal forming means of said signal generators and to said retract signal output, and said second combining logic means being connected to reset said bi-stable switch means in response to preselected release of said manually operable control elements.
A fluid control apparatus for controlling a machine having a cyclically moving tool element comprising a fluidic responsive machine control input means to selectively operate the machine to move said tool element, a plurality of manually operable fluid signal source means having a first position and operable to a second position and generating a plurality of unique fluid signals in response to movement between said first and second positions, a fluid signal logic processing means monitoring the operation of the source means and responsive only to simultaneous operation of said plurality of source means to produce a control output to said machine control input means and enabling the operation of the machine, and a sequence monitor means having a first input means connected to respond to operation of both said fluid signal source means to operatively disable the sequence monitor means and second input means connected to respond to the output of the signal logic processing means to actuate the input means and disable the machine, said monitor means responding in accordance with the first signal applied at the first and second input means and continuously monitoring the sequence of the operation of the source means and the presence of the control output and permitting operation only in response to a proper sequence including simultaneous operation of the source means prior in the absence of said control output and disabling of the machine only in response to producing of the control output at said second input means, prior to operation of the source means.
Dependencies are inferred from the claim text.