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    MULTIPLEXED HAMMER DOT BAND MATRIX PRINTER
    12.
    发明专利
    MULTIPLEXED HAMMER DOT BAND MATRIX PRINTER 未知

    公开(公告)号：CA1179891A

    公开(公告)日：1984-12-27

    申请号：CA414898

    申请日：1982-11-04

    Applicant: IBM

    Inventor： THORNE WILLIAM D

    IPC: B41J2/31 ,  B41J9/10 ,  B41J3/10

    Abstract: RA981016 MULTIPLEXED HAMMER DOT BAND MATRIX PRINTER The present invention describes a dot band matrix printer in which the pitch of the dot font elements on the moving band is precisely twice that of the pitch between hammer faces. A hammer bank is positioned for impacting the dot font elements and driving them into a printing medium. The pitch between two dot font elements is normally assigned to a single hammer, but in the present invention, the number of hammers is doubled. Also an electronic control is used so that adjacent hammers cannot be fired simultaneously. The hammers are divided into two groups with members of each group alternating on a one for one basis along the hammer bank. Control circuits are utilized to prevent one of the groups of hammers so defined from firing at the time the other group is being fired. The result is that the hammers which are fired will all be operating on the same relative dot position in their space in the line of print being formed. With normal dot band hammers, additional spacing is allowed between dots on the band to avoid the problem of nipping and crashing of the anvil elements on RA981016 the back of the dot band into extended faces of adjacent print hammers. This has created a small gap in which no dots can be created. The present invention also provides a means for automatically selecting large or small dots for printing if the print band has large and small size dot font elements alternated serially on it. It is only necessary to choose firing the hammers of the first group or the second group first in order to select large dots or small dots for printing.

    OSCILLATORY BAND AND HAMMER DOT MATRIX PRINTER
    13.
    发明专利
    OSCILLATORY BAND AND HAMMER DOT MATRIX PRINTER 未知

    公开(公告)号：CA1165173A

    公开(公告)日：1984-04-10

    申请号：CA379125

    申请日：1981-06-05

    Applicant: IBM

    Inventor： COLE NORMAN F ,  THORNE WILLIAM D

    IPC: B41J3/04

    Abstract: RA979008 OSCILLATORY BAND AND HAMMER DOT MATRIX PRINTER Described, is a printing mechanism allowing full exploitation of the potential of dot matrix printing. Dot forming elements are mounted on a carrier for transport past an array of hammers located in front of media to be marked upon. The dots or carrier are impacted by the hammers to form dots on the medium. By appropriate control of motion of the printing medium and timing of the hammer impacts, a dot may be formed anywhere on the surface of the medium. This allows unlimited character font set generation as well as special character printing for enlarged font, miniaturized font, fast rough draft copy printing, the printing of ascenders and decenders for characters and for condensed or compacted printing. In addition, the mechanism permits an all points available graphics generation system and full control for variable vertical spacing of printed elements and of variable horizontal spacing of the printed elements. Variable print element shapes, grey tone graphics printing and multi-color additive or subtractive color processes are also facilitated. To improve the throughput speed, a reversible motor is used for driving the dot element carrier and a plurality of dot font sizes and shapes are provided RA979008 23 on the carrier. By selection of the required font size and shape and by comparison with the presently known position of the carrier, the quickest access to the next desired dot font for any given hammer can be achieved.

    ELECTROMAGNETIC HAMMER ACTUATOR FOR IMPACT PRINTER
    15.
    发明专利
    ELECTROMAGNETIC HAMMER ACTUATOR FOR IMPACT PRINTER 未知

    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

    IPC: B41J9/127 ,  B41J9/38 ,  H01F7/08 ,  B41F19/00

    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.

    PRINT HAMMER MECHANISM
    17.
    发明专利
    PRINT HAMMER MECHANISM 未知

    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

    IPC: B41J2/285 ,  B41J2/245 ,  B41J9/38 ,  B41J3/00

    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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