Matrix pin print head
AssigneeMannesmann Aktiengeselschaft
InventorsJohann Stempfle, Bernd Gugel
Life of this patent
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Abstract
In a matrix pin print head, the armatures (15a) of the magnet drive (12), transferring the advance motions to the print pin, rest in each case against the print pin (4). The print pin (4) and the print pin head (22) form a rigid connection. In order to reduce friction and wear, the print pin head (22) is made of a technical ceramic material at the print pin end (21) and the print pin head (22) is formed as a molded piece (23). The print pin end (21) is adhesively attached in, pressed into, or sintered into the interior of the molded piece (23). The connection length (25) between the print pin and the print pin head corresponds at to at least twice the diameter (26) of the print pin (4).
Claims15
A matrix pin print head comprising
- a magnet drive;
- an armature;
- a print pin resting on said armature and receiving an advancing motion from said magnet drive to move said print pin from an initial position to a printing position;
- a spring force means for returning said print pin to said initial position;
- a print pin head rigidly attached to said print pin, said print pin head having an interior space and being made of ceramic material and formed as a molded piece;
- said print pin being fixedly connected to said interior space of said print pin head, the connection length between said print pin and said print pin head being at least twice the diameter of the print pin.
A matrix pin print head with several print pins and magnet drives, each of said print pins resting on an armature of one of said magnet drives for movement between an initial position and a printing position;
- spring force means for returning said print pins back to said initial position;
- a print pin head rigidly attached to each of said print pins, said print pin heads being formed of a ceramic material by molding;
- each of said print pins being adhesively attached, pressed into, or sintered to the interior of its corresponding print pin head, with the connection length between said print pin and said print pin head being at least twice the diameter of the print pin.
Dependencies are inferred from the claim text.