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Disclosed is a method for detecting the jam of an inserted form
using a sensor mounted on a print head.
English (United States)
This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
100% of the total text.
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Paper-jam detecting function
Figure shows the flowchart of this disclosure. The printer scans the form and detects the width of the sheet by using a optical sensor which is mounted on the print head while printing each line. If the printer detects the change of the width of the form, the printer moves the form forward a certain amount of steps then scans again to prevent detecting a black mark on the form. After detecting the width of the form, and the width becomes narrow, the printer judges the form is jammed.
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Insertion of a form
End of Transaction
Feed form to scan Position
Scan form Width & save
Data Handling (Print/Feed)
Form Width Scanning position?
Width = previous?
Width & save
[This page contains 5 pictures or other non-text objects]
Page 3 of 3
Disclosed by International Business Machines Corporation