Typewriting machines – Including type-set-assemblage mounted on carrier and... – Imprint by pivoting of type-head-carrier and type-head...
Patent
1991-08-02
1993-04-13
Wiecking, David A.
Typewriting machines
Including type-set-assemblage mounted on carrier and...
Imprint by pivoting of type-head-carrier and type-head...
4001573, 101 9303, B41J 948
Patent
active
052018768
ABSTRACT:
The method for determining impact energy of a type element of the printing machine includes providing at least two different-length flight paths for the type elements by changing a distance between a resting position of the hammer and a place of impact of the type elements by at least one known amount; measuring at least two different hammer flight times corresponding to the at least two different-length flight paths of the type elements differing by the at least one known amount, each of the different hammer flight times being equal to a difference between a time of impact of one of the type elements and a time of onset of current flow in the hammer electromagnet; forming a difference between two different hammer flight times; dividing the known amount by which the two flight paths associated with the two different hammer flight times differ by the difference determined for the two hammer flight times to obtain a speed of the type element at impact and thus the impact energy of the type element. By comparing the actual value of the hammer flight time differences with a set value for the flight time differences the impact energy of a type element can be electronically controlled by controlling current flow in the hammer electromagnet.
REFERENCES:
patent: 4173927 (1979-11-01), Van Kempen et al.
patent: 4547087 (1985-10-01), Heider et al.
patent: 4797017 (1989-01-01), Okouchi
patent: 4880322 (1989-11-01), Jensen et al.
patent: 4911568 (1990-03-01), Makiura
IBM Technical Disclosure Bulletin, vol. 28, No. 10, Mar. 1986 "Algorithm for Magnetic Sensing of Print Actuator Dynamics".
IBM Technical Disclosure Bulletin vol. 24 No. 3 Aug. 1981 "Print Velocity Pendulum".
IBM Technical Disclosure Bulletin vol. 32 No. 8A Jan. 1990 "Print Hammer Impact Detection Circuit".
Hendrickson Lynn D.
Ta Triumph-Adler AG
Wiecking David A.
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