Daisy type print wheel apparatus
AssigneePeriphonics Corporation
InventorEvan L. Ragland, III
Life of this patent
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Abstract
Printing apparatus uses a daisy type print wheel which is continuously driven through a magnetic clutch arrangement. Characters are selected by actuation of either an electromagnetic brake acting on the print wheel or a toothed character selector acting on the spokes of the print wheel. When a character is selected and the print wheel is stopped, rotation of the motor continues because of the slippage of the magnetic clutch. Other features of the invention include a fast recovery time for the hammer because of its constant rate of actuation, a change in spacing by varying this constant rate and also an improved carriage scan technique which provides for fast return.
Claims15
Printing apparatus comprising:
- a daisy type print wheel including a plurality of print elements carried on spokes radiating out from the wheel axis such print elements being oriented to lie in a plane perpendicular to said axis and including a fixed portion of magnetic material;
- means for rotating said wheel around its axis including drive shaft means;
- print hammer means adapted to impact a selected print element while such element is stopped;
- magnet means producing a magnetic field mounted for rotation with said drive shaft means and said wheel;
- brake means separate from said print hammer means and having only a single movable component which interfaces with said print wheel, for acting on said wheel for stopping its rotation and selecting one of said print elements for positioning such element to be hit by said hammer means;
- magnetic material means connected to said drive shaft means and juxtaposed with said magnet means and rotatable with said fixed wheel portion in a physical relationship to provide a substantial magnetic coupling force between said wheel and said drive shaft means and for allowing said wheel and shaft means to have relative rotary motion therebetween when said brake means is actuated.
Dependencies are inferred from the claim text.