Browse Prior Art Database

Cover Interlock Velocity-Limiting System

IP.com Disclosure Number: IPCOM000064124D
Original Publication Date: 1985-Jun-01
Included in the Prior Art Database: 2005-Feb-18

Publishing Venue

IBM

Related People

Authors:
Cavill, BR Schulz, RA [+details]

Abstract

A technique is described whereby the speed of the printhead used in high speed printers is controlled through the use of a cover interlock velocity-limiting system, so as to eliminate a hazardous condition in the event the printer cover is opened during operation. In prior art, the operating voltage to a printhead motor is disconnected whenever the front/top cover is opened by the operator, so as to prevent injury from the high-speed print mechanism. This could cause printing difficulty, in that the printer has failed to complete the line it was printing. The circuit, as shown in the figure, provides an inexpensive method of reducing the speed of the printhead, during the opening of the cover, so as to allow line printing to continue. The printhead movement is now slow enough to prevent any injury to the operator.