Print hammer mechanism

Details Print hammer mechanism Print hammer mechanism

B - Operations, Transporting

41

J

101/94

B41J 3/00 (2006.01) B41J 9/38 (2006.01)

Patent

CA 1181988

PRINT HAMMER MECHANISM Abstract An improved print hammer and actuator mechanism there- for are described. A hammer face having an extendable width but which is supported to provide good torsional resistance against impacts occurring near the extreme ends of the hammer face has been developed. The hammer mechanism comprises a solenoid plunger and push wire or push rod which is directly affixed to one end of the hammer. The opposite end of the hammer is flexibly or pivotably mounted by a spring. The spring is a flat or individual leaved style. The spring is rigidly affixed to the bottom portion of the hammer. It is flexed or twisted to enable the hammer top portion to be deflected. A shock absorbing connector connects the push wire to the print hammer. The plunger in the solenoid is biased to the off-center position in which it partly protrudes from the solenoid coil. It is biased by the action of the flexible spring restoring the hammer to the unactuated position. The position of the plunger can be adjusted by adjustable abutments at either end of its throw. This adjusts the flight time and the impact force, as well as the relative rest position of the hammer face, since the push wire is firmly connected -2- to both the plunger and to the top of the hammer mechanism. The shock absorbing connector between the end of the push wire and the hammer mechanism controls the amount of force applied at impact. The hammer itself may be made of molded plastic and a metallic insert as an impact face may be added if desired. Low mass and high torsional rigidity in a wide-faced hammer that spans multiple character positions is thus achieved and maintained by the rigid attachment to the flexural spring mount which is affixed at 90° to the general length of the hammer and in a plane perpendicular to the print line so that torsional forces applied by impacts at either end of the hammer face are resisted by tending to place the flat spring in compression. Field of the Invention This invention relates to impact printer mechanisms in general and specifically to impact hammer and driver mechanisms therefor intended for dot character or full engraved character impact printing machines. Prior Art A variety of impact hammer mechanisms exists in the known art. Most of the hammer mechanisms have a face having a width of only one or two characters. While hammers having extended widths spanning up to six or eight characters are known, these mechanisms are relatively expensive to build, are massive, and are difficult to drive at high speeds because of their size and mass. In addition, the great width of the hammer face creates torsional twisting moments that can cause variable force to be applied and the resultant varia- tion in character intensity due to deflection of the hammer face.

414897

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