Browse Prior Art Database

Velocity Measuring Technique

IP.com Disclosure Number: IPCOM000043266D
Original Publication Date: 1984-Aug-01
Included in the Prior Art Database: 2005-Feb-04
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Lansing, SG: AUTHOR [+2]

Abstract

A print hammer mechanism comprises an electromagnetic operator having core 10 with pole 11 and winding 12, pivoted armature 13, push rod 14 and pivoted hammer element 15. The hammer mechanism is operated by energizing winding 12, causing armature 13 to be rotated until it seals against the face of pole 11, whereupon push rod 14 and hammer element 15 continue in motion at relatively constant velocity until the hammer element 15 impacts a platen 16. The velocity measurement technique comprises the steps of detecting the position of the hammer element 15 at or about seal time of the armature 13 and the position of the hammer element 15 just prior to the hammer impacting the platen 16. As seen in the figure, optical sensor 17A detects hammer displacement at or near the time armature seals against pole 11.

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Velocity Measuring Technique

A print hammer mechanism comprises an electromagnetic operator having core 10 with pole 11 and winding 12, pivoted armature 13, push rod 14 and pivoted hammer element 15. The hammer mechanism is operated by energizing winding 12, causing armature 13 to be rotated until it seals against the face of pole 11, whereupon push rod 14 and hammer element 15 continue in motion at relatively constant velocity until the hammer element 15 impacts a platen 16. The velocity measurement technique comprises the steps of detecting the position of the hammer element 15 at or about seal time of the armature 13 and the position of the hammer element 15 just prior to the hammer impacting the platen 16. As seen in the figure, optical sensor 17A detects hammer displacement at or near the time armature seals against pole 11. The output of sensor amplifier 17 triggers oscilloscope 18. The A gate signal from the oscilloscope is used to trigger strobe light 19 which is set to flash on the hammer element 15 which is observed by a microscope. The microscope has a calibrated eyepiece 20 which is lined up with the edge of hammer element 15. The first setting of the eyepiece 20 is recorded as position and time #1. The oscilloscope delay time is then increased so that hammer element moves forward to a second reticle of the eyepiece 20 which is recorded as position and time #2. The hammer mechanism is operated numerous times for each setting of the reticle and an aver...