Patent ID: 7307525

Claim:
An instruction drop-off warning system comprising: identification-information storing means, which is incorporated in an instruction sheet used for conveying to a worker an operation to be performed on a work object and which enables identification information of said instruction sheet to be read without physical contact; instruction-information storing means, which stores as instruction information said identification information of said instruction sheet attached on said work object in correspondence with management information of said work object; information-reading/writing means, which reads or writes said identification information from or into said identification-information storing means of said instruction sheet attached on said work object; instruction-information adding means, which writes, in said instruction information, said identification information of said instruction sheet when said instruction sheet is attached to said work object; removal-information writing means, which writes, in said instruction information, said identification information of said instruction sheet when said instruction sheet is removed from said work object; instruction-presence checking means, which compares said identification information retrieved from said identification-information storing means of said instruction sheet by said information-reading/writing means with said instruction information stored in said instruction-information storing means and checks if said instruction sheet has dropped off; and warning means, which warns of the drop-off of said instruction sheet if said instruction-presence checking means judges that said instruction sheet has dropped off.