Typewriting machines – Platen or platen-moving mechanism – Cylindrical platen
Patent
1986-10-31
1988-10-25
Wiecking, David A.
Typewriting machines
Platen or platen-moving mechanism
Cylindrical platen
101 9314, 400146, 400703, B41J 1108
Patent
active
047800151
ABSTRACT:
A platen assembly for an impact printer comprises the combination of an impact transducer between the backup plate and the type band of a printer and an impact isolator interposed between the transducer and the type band. The transducer comprises a strip of force sensitive material. The strip extends over a plurality of print positions. Electrode means in contact with the surfaces of the force sensitive material form discrete impact zones aligned with the print hammers. One of the electrode means is a continuous conductive strip on one side of the force sensitive strip. Plural conductive pads on the other side of the strip form the discrete impact zones. The continuous conductive strip is preferably on the side facing the type band and serves as the ground connection. The impact isolation means comprises plural force elements between the type band and the transducer element and preferably is part of a comb which can be conductive and provides stiffening to the force sensitive strip. The transducer element can be a foil using PVF2 with etched conductive patterns forming the electrodes.
REFERENCES:
"Print Hammer Flight Time Transducer", G. F. Pennell et al., IBM Tech. Disc. Bull.; vol. 22, No. 8B, p. 3673; Jan. 1980.
"Platen with Imbedded Transducers . . . ", W. T. Chen et al., IBM Tech. Disc. Bull.; vol. 24, No. 10, pp. 5084-5085; Mar. 1982.
"Multi-Function Impact Detector for Impact Printers"; E. Hindermeyer; IBM Tech. Disc. Bull.; vol. 27, No. 6, p. 3345; Nov. 1984.
"Instrumented Printer Platen with Feedback Control"; Anonymous; IBM Tech. Bull.; vol. 28, No. 4, pp. 1678-1680.
"Piezoelectric Transducer for Determining the Impact Times of Print Hammers"; Anonymous; IBM Tech. Disc. Bull.; vol. 29, No. 3, p. 1152; Aug. 1986.
Anderson Lawrence L.
Helinski Edward F.
Meier Johann H.
Zable Jack L.
Gasper John S.
International Business Machines - Corporation
Wiecking David A.
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