US 4,375,338 A · Wire dot print head

Abstract

An improved wire dot print head assembly for a wire dot printer including a resilient securing spring for holding the assembly elements secure is provided. The print head assembly includes a plurality of print wires, each selectively driven through a print nose by a plurality of electromagnets disposed about the print wires. A pivotable operating member engaged to the input end of the wire is actuated by an electromagnet with the fulcrum end of the operating member secured by a holding member. The holding member, nose, electromagnet and operating member are compressively retained by the resilient securing spring. The holding member is formed with a projection extending through the fulcum portion of the operating member to minimize magnetic reluctance of the magnetic flux by minimizing an air gap between a plunger mounted on the operating member and a yoke plate. The print head constructed in accordance with the invention permits improved dimensional accuracy in a simplified construction.

Claims8

Dependent claims

A wire dot print head comprising:

a print head nose having a hollow core;
a plurality of print wires slideably mounted in said core;
a plurality of selectively operable electromagnetic means disposed about said core;
operating means operatively coupled between said print wires and said electromagnetic means adapted for pivotable displacement by said electromagnetic means for selectively displacing said print wires between a first at rest position and a second print position;
holding means mounted on said operating means for supporting said operating means in position adjacent said electromagnetic means;
and
securing means for holding said holding means in position for maintaining the position of said operating means between said holding means and said electromagnetic means and said nose, wherein said securing means is a securing spring having a central region and outwardly extending arms for engaging said nose for securing said holding means against said operating means and said electromagnetic means.

4 more elements

Dependencies are inferred from the claim text.

Wire dot print head

Life of this patent

Wire dot print head

Life of this patent

Abstract

Claims8