Printing – Selective or progressive – Bed and platen machines
Patent
1975-06-12
1976-10-05
Coven, Edward M.
Printing
Selective or progressive
Bed and platen machines
101 9334, B41J 902
Patent
active
039838064
ABSTRACT:
A hammer bank assembly useful in high speed, moving type, impact printers of the kind generally employed in data processing systems. The assembly is comprised of a mounting structure supporting a plurality of aligned hammer modules and a plurality of aligned magnet modules. The mounting structure includes a rigid cylindrical tube and a plurality of fastening members disposed therealong. Each hammer module includes multiple hammers resiliently mounted on a common foot member. Each hammer is comprised of an impact tip carried on a rigid coil structure. Each hammer module foot member has a recess of substantially semicircular cross section dimensioned to conform to the periphery of the rigid tube. A plurality of identical hammer modules are mounted on the rigid tube with each foot member being secured to a different fastening member and with the tube engaging each foot member in the recess thereof. Each magnet module includes multiple permanent magnets rigidly mounted on a common foot member having a recess of substantially semicircular cross section, also dimensioned to conform to the tube periphery. A plurality of magnet modules are mounted on the rigid tube with the foot members thereof secured to said fastening members and with the magnets thereof interleaved with said hammers so that each hammer coil structure is disposed in a permanent magnet field. Energization of the coil develops a force on the coil structure to propel the hammer toward the moving type surface. Each magnet module also includes multiple adjustable backstops, each for bearing against and establishing the rest position of a hammer.
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patent: 3714892 (1973-02-01), Perry
patent: 3843083 (1974-10-01), Angibaud
Coven Edward M.
Data Products Corporation
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