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Typewriter and Printer Impact Force Measurement using Piezoelectric Film Platen

IP.com Disclosure Number: IPCOM000115643D
Original Publication Date: 1995-Jun-01
Included in the Prior Art Database: 2005-Mar-30
Document File: 2 page(s) / 47K

Publishing Venue

IBM

Related People

Fish, GL: AUTHOR [+2]

Abstract

Disclosed is a method and apparatus for measuring impact forces at any point along the length of a typewriter or printer platen by mounting a piezoelectric film along the length of the platen or around its circumference. This method is reliable, fast and inexpensive compared to known impact force measurement techniques.

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This is the abbreviated version, containing approximately 70% of the total text.

Typewriter and Printer Impact Force Measurement using Piezoelectric
Film Platen

      Disclosed is a method and apparatus for measuring impact forces
at any point along the length of a typewriter or printer platen by
mounting a piezoelectric film along the length of the platen or
around its circumference.  This method is reliable, fast and
inexpensive compared to known impact force measurement techniques.

      In the invention disclosed, a Piezoelectric (PVF2) film on the
platen acts as a force measuring transducer.  Piezoelectric film
produces a measurable electrical charge output for a given force
input, similar to a piezoelectric force transducer.  The film may be
installed in one of two ways.

      In a first method, a long, thin strip of PVF2 film is imbedded
along the length of the platen.  The strip is applied by first
cutting a channel in the platen rubber, gluing the film in the
channel, and gluing another piece of rubber over the film.  The
platen
is then reshaped on a grinding machine to restore its original form.

      Alternatively, a channel is cut around the circumference of the
platen, and the film installed in the same manner just described.
The width of the film may vary according to the application.  Another
strip of rubber is then glued to the top of the film, and the platen
is ground to its original shape.

      In either case, it is important that the film be "sandwiched"
between the two rubber strips.  The film cannot b...