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US 4,230,411 AGranted
Matrix printer
OwnerHelmut Grottrupinventor
Life of this patent
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OwnerHelmut Grottrupinventor
Estimating the term…
A matrix printer in which a plurality of printing punches in the form of sheet strips are arranged parallel to each other and are driveable in different combinations, according to the characteristics to be printed, by means of drive systems arranged in series and being associated each with a printing punch. Each drive system contains an armature, mechanically coupled to a printing punch, a magnetic circuit providing for an air gap, and a control coil. Also associated with each printing punch is a reset spring, for pulling the armature away from the air gap range into the inoperative position. The reset spring is loop-shaped and integrally formed with the associated printing punch. The magnetic circuit is provided with an air gap which is smaller than the stroke of the printing punch, so that even after closure of the air gap, the armature flies on substantially freely due to its inertia, until the printing punch strikes.
In a matrix printer in which a plurality of printing punches in the form of sheet strips are arranged parallel to each other and are driveable in different combinations according to the characteristics to be printed, by means of drive systems arranged in series and being associated each with a printing punch, each drive system containing an armature mechanically coupled to the printing punch, as well as a magnetic circuit providing for an air gap and a control coil, and a reset spring being associated with each printing punch for pulling the armature away from the air gap range into an inoperative position, the improvement which comprises said reset spring being loop-shaped and formed as an integral part of an associated printing punch at the stationary end thereof, and lying in the same plane as that of the associated printing punch.
Dependencies are inferred from the claim text.