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公开(公告)号：BR8507231A
公开(公告)日：1987-10-27
申请号：BR8507231
申请日：1985-06-20
Applicant: IBM
Inventor： PATTERSON WILLIAM A , MCELROY ROBERT M , MAGUIRE THOMAS A , COLE NORMAN F , THORNE WILLIAM D
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公开(公告)号：CA1258246A
公开(公告)日：1989-08-08
申请号：CA514907
申请日：1986-07-29
Applicant: IBM
Inventor： THORNE WILLIAM D , BROWN DOUGLAS S , PATTERSON WILLIAM A
Abstract: ELECTROMAGNETIC HAMMER ACTUATOR FOR IMPACT PRINTER The present invention relates to an assembly of electromagnetic actuators for the hammers of an impact printer arranged side by side and extending along a line. Each actuator comprises a first stator part formed with at least one pole piece, a second stator part formed with at least one pole piece and positioned relative to the first stator part so that the pole pieces are spaced apart so as to form a gap therebetween. A single coil is associated with one of the stator parts. Each actuator also includes an armature member formed with a body of non-magnetizable material, at least one armature element of magnetizable material and a hammer head. The armature member is supported between the stator parts so that the armature element is located adjacent to the gap. Energization of the coil causes the generation of a flux which passes across the gap and through the armature element tending to move the armature element into the gap and to cause the hammer head to move into a print position. According to the invention the components of adjacent actuators are complementary in shape so that projecting components of each actuator engage in recessed components of the adjacent actuators whereby the overall length of the assembly along the line is less than the sum of the overall widths of the individual actuators.
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公开(公告)号：CA1181988A
公开(公告)日：1985-02-05
申请号：CA414897
申请日：1982-11-04
Applicant: IBM
Inventor： THORNE WILLIAM D , PATTERSON WILLIAM A
Abstract: PRINT HAMMER MECHANISM An improved print hammer and actuator mechanism therefor 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 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.degree. 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 variation in character intensity due to deflection of the hammer face.
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