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Jam Detection System

IP.com Disclosure Number: IPCOM000097342D
Original Publication Date: 1962-Oct-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 34K

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Related People

Cutaia, A: AUTHOR [+2]


The arrangement detects document misfeeds or jams in an asynchronous document handling machine.

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Jam Detection System

The arrangement detects document misfeeds or jams in an asynchronous document handling machine.

With documents in the hopper, when the start key for the machine is depressed, a 1 is placed into the first position of an N-position shift register by a circuit, not shown. The shift register is then advanced by timing pulses supplied by an emitter operated from the document transport driving shaft. The 1 in the shift register is advanced for each predetermined increment of feed and, when the 1 reaches the Mth position of the shift register, a latch A is checked together with other conditions by a logic circuit.

This provides an output, if the first document has not reached document detector CD1. This output, designated hopper misfeed, is used to stop the machine or provide other necessary action.

Assuming no document misfeed occurs, the 1 in the shift register continues to advance until it reaches the Nth position of the shift register. Now, a latch C, operated by document detector CD3, is compared along with other conditions in a second logic circuit. The output indicates a jam in the transport in the event that the document has not reached location CD3 by the time the Nth position in the shift register is turned on.

The trailing edge of the first document on leaving position CD1 causes latch A to be turned on again and another 1 inserted in the first position of the shift register. This provides a check on the proper distance between the first...