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Browse Prior Art Database

High Resolution Document Stopping and Clutch Stop Correction System

IP.com Disclosure Number: IPCOM000086856D
Original Publication Date: 1976-Nov-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 3 page(s) / 56K

Publishing Venue

IBM

Related People

Wallace, LJ: AUTHOR

Abstract

This system provides a high-resolution document stopping and clutch control correction system particularly intended for use in a document transport utilized with an optical character recognition system( OCR).

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High Resolution Document Stopping and Clutch Stop Correction System

This system provides a high-resolution document stopping and clutch control correction system particularly intended for use in a document transport utilized with an optical character recognition system( OCR).

Referring to the figure, an up-down counter 3 of the binary tape, shown with nine stages, is utilized to store a clutch stop delay constant and allows adjustment of this constant to plus or minus one unit during each clutch operating cycle. A second binary counter 5 is used as a document tracking counter to track the document position during operation and during the initial setup time to, first, measure the clutch stop distance and, second, in conjunction with counter 3, to determine a stop delay constant. A compare circuit 7 monitors the outputs of the counters to provide an output when the counts are equal. Thus, the compare circuit monitors the document position and the stop delay constant and determines when to signal the clutch to stop, that is, when the count in counter 3 matches the count in counter 5. The outputs of counter 5 are provided to a set of circuits 9, which are connected in bus fashion to the associated optical character reader, to provide a signal which determines the initial positioning of the flying- spot scanner beam utilized with the OCR system.

Also, an AND circuit 11 is connected to the outputs of counter 5 in such fashion that circuit 11 provides an output any time that the counter 5 contains a count which is greater than 472 units. In this case, a latch 13 (PAST NOMINAL) is turned on by the output of AND circuit 11. The purpose of this latch is to determine, first, if the document stopped before or past the nominal stop position and, second, to determine the plus or minus adjustment of the stop delay constant.

A flip-flop circuit 15 (MEASURE & STORE CYCLE) controls, first, the initial setup of the system and, second, in the diagnostic mode, measurements of the clutch stop distance with respect to time.

A flip-flop circuit 17 (STORE STOP DLY CONSTANT) controls the generation and storing of the stop delay constant for the system. A single shot 19, having a nominal delay of 1.3 milliseconds and adjustable thereabout, is used to set the nominal stop position for the system.

A flip-flop circuit 21 (TRACK DOC POS) controls, first, the tracking of the document position and, second, the measurement of the clutch stop distance.

During the initial setup of the system or document run-in, a signal on a line 23 (SIMULATED-7) starts the sequence by turning on the single shot 19, via an OR circuit 25, and trigger 15. The same signal is supplied through an OR circuit 27 to reset counter 3 and via the second OR circuit 29 to reset counter 5. The output of OR circuit 29 also resets the latch 13.

When the single shot 19 times out, the flip-flop 21 is turned on, which conditions the clutch to stop and gates emitter pulses from an emitter driven by th...