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This system includes a microprocessor and associated hardware arranged to prevent accumulated forms movement error and to allow compensation for different forms thicknesses.
English (United States)
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Self Correcting Forms Movement System
This system includes a microprocessor and associated hardware arranged
to prevent accumulated forms movement error and to allow compensation for
different forms thicknesses.
The microprocessor (controller) 1, a destination register 2, and a forms
position (hardware) counter 3 are shown in the drawing. The various elements
could be solely software or hardware or a combination of these. The forms
position counter 3 is either incremented or decremented through an emitter
decode circuit 4 by a change in state of an emitter 5 attached to a forms motor 6
driving a continuous form 7.
The system initiates forms motion and monitors the motor so that there will
never be any accumulated error in that motion. One emitter change is equal to
one step, and the distance to be moved is evaluated in the number of steps.
This is done in the following manner. When in a "Power On"
sequence or when redefining the forms position, register 2 in the
microprocessor is set equal to the value in forms position counter 3.
Then, if the forms are to be moved as indicated by a Forms Command,
the desired distance is added to register 2 and motion is initialized
by setting a stop count in latches 8. Forms movement is initiated by
way of line 9 in a prescribed direction until the forms position
counter matches the stop count as determined by comparator 10. Then,
the deceleration of the forms motor is initiated by way of line 11.