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    THERMAL PRINTER
    1.
    发明专利
    THERMAL PRINTER 未知

    公开(公告)号：CA1241228A

    公开(公告)日：1988-08-30

    申请号：CA508030

    申请日：1986-04-30

    Applicant: IBM

    Inventor： ENGLE VENCIL D ,  HAFER CAMERON H ,  HUGHES FRANK M ,  STEGER DONALD J ,  STEWART EDWARD G ,  STREET RAMON L ,  THOMPSON JOHN A

    IPC: B41J32/02 ,  B41J33/24 ,  B41J33/26 ,  B41M5/26 ,  B41J33/00

    Abstract: THERMAL PRINTER A thermal printer (10) has a thermal transfer medium (28) fed past a thermal printhead (21) at a substantially constant velocity by a feed roll (82) engaging the thermal transfer medium just prior to the printhead to maintain a portion of the thermal transfer medium between the printhead and the feed roll relatively stiff. The feed roll is mounted on a cartridge (30) having the thermal transfer medium supplied therefrom. A drag brake (70) is disposed in the feed path of the thermal transfer medium prior to the feed roll to cause a substantially constant premetering tension to be applied to the thermal transfer medium irrespective of the coefficient of friction between the drag brake and the thermal transfer medium. A carrier (14), which supports the printhead and a feed roll driver (90), is driven separately from the feed roll driver so that various ratios between the velocities of the thermal transfer medium and the carrier are obtained to produce various print qualities. One print quality occurs in a draft mode, which is a relatively high speed, in which there is substantial conservation of the thermal transfer medium. The peel angle of the thermal transfer medium from a recording medium (12) on which printing occurs is maintained at a relatively low angle to increase the contact time between the thermal transfer medium and the recording medium.

    MAGNETIC BRUSH DEVELOPER
    2.
    发明专利
    MAGNETIC BRUSH DEVELOPER 未知

    公开(公告)号：CA1078169A

    公开(公告)日：1980-05-27

    申请号：CA262155

    申请日：1976-09-27

    Applicant: IBM

    Inventor： ABBOTT JERRY J ,  CAMPBELL CHARLES A ,  CAUDILL ALLISON H ,  THOMPSON JOHN A

    IPC: G03G15/08 ,  G03G15/09

    Abstract: MAGNETIC BRUSH DEVELOPER An auger fed magnetic brush developer wherein two parallel augers continuously recirculate the developer mix and cause the mix to be enriched with toner prior to its being returned to the magnetic brush roll. A supply auger communicates with the brush roll along its entire length and directly elevates the mix to a lower part of the brush roll's surface. This supply auger includes four flutes of a pitch equal to one-half the length of the brush roll. This auger flute arrangement insures that a uniform supply of mix is presented to the brush roll along its entire length. In addition, this supply auger construction insures that a uniform supply of enriched mix is presented to the brush roll along its entire length, since the gradually depleting carrier tends to be presented to the brush roll a minimum number of times, for example three, prior to its exiting one end of the supply auger. The carrier exiting the supply auger enters a turnaround compartment whereat new toner is added. The depleted carrier and new toner is mixed by a return auger. To insure adequate triboelectric agitation, the return auger includes two flutes of a pitch equal to that of the supply auger. The two augers are rotated at different flute and pitch related speeds which insure equal flow through the augers. The two augers are of equal length, and are longer than the brush roll. The two augers are mounted in axially offset fashion, with the opposite end of each auger substantially coextensive with opposite ends of the brush roll, and with the other end of each auger extending into end disposed turnaround compartments. -1a-

    ELECTROPHOTOGRAPHIC DEVELOPER WITH CARRIER OVERFLOW CONTROL
    6.
    发明专利
    ELECTROPHOTOGRAPHIC DEVELOPER WITH CARRIER OVERFLOW CONTROL 未知

    公开(公告)号：CA1108844A

    公开(公告)日：1981-09-15

    申请号：CA309376

    申请日：1978-08-15

    Applicant: IBM

    Inventor： ABBOTT JERRY J ,  BERNARDELLI WILLIAM J ,  CAUDILL ALLISON H ,  THOMPSON JOHN A

    IPC: G03G15/09

    Abstract: ELECTROPHOTOGRAPHIC DEVELOPER WITH CARRIER OVERFLOW CONTROL A magnetic-brush developer for use in an electrophotographic machine wherein the magnetic brush is used to transport toner-coated carrier particles to an elevated development zone from a pickup zone. A path for so moving the carrier is provided between the magnetic brush roll and an overflow plate, the lower end of which also serves as a doctoring blade. The carrier is moved to the top of the roll where a doctoring blade limits the amount of carrier entering the development zone. Excess carrier is accumulated in an expanded spatial area near the doctoring blade and returned to the vicinity of the pickup zone by falling back between the overflow plate and the housing. An area is provided near the doctoring blade at the top of the roll where no magnetic field is present. The overflow plate is made of non-magnetic material.

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