Abstract:
A system for visually displaying interlaced data stored in a recirculating delay line. The stored data is in six functions, each function comprising three eight digit words. Data within each function is interlaced by presenting the least significant digit of all three words, followed by the next to least significant digit of all three words and so on. The data display may be single selected words or may comprise display of particular words in predetermined sequence. Sequential display of all three words in selected functions is accomplished by providing a three bit recirculating shift register. The sequencing rate is controlled by a variable frequency oscillator. It is also possible to sequentially select the data associated with each letter address. This is accomplished by way of a second recirculating shift register whose sequencing rate is also controlled by the variable frequency oscillator. As the data is selected, it is fed into a third shift register where it is stored in binary coded decimal. A BCD to decimal converter converts the contents of the third shift register to decimal format. THe output of the BCD to decimal converter feeds the display device. The rate at which the contents of the third shift register are ''''updated'''' may also be controlled by providing an oscillator whose frequency determines the ''''update'''' rate.
Abstract:
The torque losses in the spindle drive of a cutting tool rotating under no-load conditions are measured and stored in digital form. The stored value is used to modify programmed torque values during a later cutting operation so as to achieve the programmed torque at the cutting tool rather than merely at the spindle drive.
Abstract:
A serial digital adding/subtracting arrangement for binary coded decimal data presented in interlaced format. The input data comprises a series of multidigit decimal words interlaced by serially presenting the least significant digit of each word in predetermined sequence, followed by the next digit of each word similarly interlaced, and so on throughout the data. The adding/subtracting utilizes two full adder/subtracters, the first for adding or subtracting the input data, the second for adding or subtracting six to or from the sum or difference generated by the first. The presence of a carry from either adder during the fourth bit time indicates the need for a radix correction from binary to decimal in which case the output of the second adder is selected. Several shift registers, one associated with each word, are provided to store the interdigital carries associated with that word during the processing of other words through the system.
Abstract:
THE FEEDBACK WAVEFORM IN A CLOSED LOOP POSITION CONTROLLING SYSTEM FOR CONTROLLING THE SPEED OF A SPINDLE IS USED TO GENERATE AN ENVELOPE WAVEFORM WHICH SETS THE LIMITS OF THE SYSTEM RESPONSE. IN THE CLOSED LOOP POSITION CONTROLLING SYSTEM, THE SPEED OF THE SPINDLE MOTOR IS CONTROLLED BY A TRAIN OF VELOCITY PULSES. THE VELOCITY PULSES ARE ACCUMULATED BY A COMMAND PHASE COUNTER WHOSE OUTPUT PHASE IS COMPARED WITH THE PHASE OF A FEEDBACK WAVEFORM WHOSE PHASE IS RELATED TO THE SPINDLE MOTOR ROTATIONAL POSITIN. THE PHASE DIFFERENCE DRIVES THE MOTOR IN A DIRECTION TO REDUCE THE PHASE DIFFERENCE TO ZERO. AT THE START OF EACH SPINDLE SPEED MONITORING CYCLE, A FAST AND SLOW PHASE COUNTER ARE CLEARED, PRESET AND STARTED COUNTING BY ONE OF THE FEEDBACK PULSES. THE PRESETTING OPERATION CAUSES THE INITIAL PHASE PRESET OF THESE COUNTERS TO STRADDLE THE PHASE OF THE FEEDBACK PULSE. THE FAST COUNTER PROVIDES AN OUTPUT WAVEFORM WHICH HAS ITS PHASE ADVANCING SLIGHTLY FASTER THAN THE PHASE OF THE OUTPUT
SIGNAL OF THE COMMAND PHASE COUNTER. THE SLOW COUNTER PROVIDES AN OUTPUT WAVEFORM WHICH HAS ITS PHASE ADVANCING SLIGHTLY SLOWER THAN THE PHASE OF THE OUTPUT SIGNAL OF THE COMMAND PHASE COUNTER. THE TERMINATION OF EACH FEEDBACK PULSE IS COMPARED IN PHASE WITH THE OUTPUTS FROM THE FAST AND SLOW COUNTERS, AND AN INDICATION IS PROVIDED IF THE FEEDBACK WAVEFORM FALLS OUTSIDE OF THE LIMITS SET BY THE FAST AND SLOW COUNTER WAVEFORMS.