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公开(公告)号：CA1092639A
公开(公告)日：1980-12-30
申请号：CA250130
申请日：1976-04-13
Applicant: IBM
Inventor： SMITH GERALD L , BACON JAMES L
Abstract: PHOTOCONDUCTOR CHARGING TECHNIQUE In an electrophotographic copying device having charging, imaging, developing, transferring, precleaning and cleaning facilities, the arrangement being in the conventional sense, but incorporates a combined charging and precleaning unit that is operable to perform either the charging function or the precleaning function at the proper time during the copying/cleaning cycle. A combined precharging/transferring unit is also incorporated to facilitate precharging or transferring at a predetermined time during the copying process.
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公开(公告)号：CA1135337A
公开(公告)日：1982-11-09
申请号：CA324003
申请日：1979-03-22
Applicant: IBM
Inventor： FORD LELAND W , RAMIREZ ALBERTO M , SMITH GERALD L
IPC: H02M3/28 , H01F27/28 , H01F30/10 , H02M3/337 , H02M7/10 , H02M7/5383 , H02M7/53846 , H02M3/06 , H02M9/04 , G03G15/00
Abstract: HIGH FREQUENCY HIGH VOLTAGE POWER SUPPLY A compact and lightweight power supply particularly suited for use as a high voltage supply capable of switching voltage values in short time. The high voltage output is compared against a desired reference value to produce a difference voltage which is integrated. The integrated difference voltage is converted to recurrent pulses having a corresponding width. The pulses are applied alternately to the opposite ends of a centertapped primary winding of a specially wound transformer characterized by a specially wound secondary winding and an air-gapped E-shaped core linking the primary and secondary windings. The secondary voltage is applied to a voltage multiplier circuit to produce the high voltage output of the power supply.
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公开(公告)号：FR2423813A1
公开(公告)日：1979-11-16
申请号：FR7906428
申请日：1979-03-08
Applicant: IBM
Inventor： FORD LELAND W , RAMIREZ ALBERTO M , SMITH GERALD L
IPC: H02M3/28 , H01F27/28 , H01F30/10 , H02M3/337 , H02M7/10 , H02M7/5383 , H02M7/53846 , G05F1/12 , G03G21/00
Abstract: A compact and lightweight power supply particularly suited for use as a high voltage supply capable of switching voltage values in short time. The high voltage output is compared against a desired reference value to produce a difference voltage which is integrated. The integrated difference voltage is converted to recurrent pulses having a corresponding width. The pulses are applied alternately to the opposite ends of a centertapped primary winding of a specially wound transformer characterized by a specially wound secondary winding and an air-gapped E-shaped core linking the primary and secondary windings. The secondary voltage is applied to a voltage multiplier circuit to produce the high voltage output of the power supply.
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Patent Agency Ranking
公开(公告)号：DE2915218A1
公开(公告)日：1979-10-31
申请号：DE2915218
申请日：1979-04-14
Applicant: IBM
Inventor： FORD LELAND W , RAMIREZ ALBERTO M , SMITH GERALD L
IPC: H02M3/28 , H01F27/28 , H01F30/10 , H02M3/337 , H02M7/10 , H02M7/5383 , H02M7/53846 , H02P13/22
Abstract: A compact and lightweight power supply particularly suited for use as a high voltage supply capable of switching voltage values in short time. The high voltage output is compared against a desired reference value to produce a difference voltage which is integrated. The integrated difference voltage is converted to recurrent pulses having a corresponding width. The pulses are applied alternately to the opposite ends of a centertapped primary winding of a specially wound transformer characterized by a specially wound secondary winding and an air-gapped E-shaped core linking the primary and secondary windings. The secondary voltage is applied to a voltage multiplier circuit to produce the high voltage output of the power supply.
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公开(公告)号：CA1124794A
公开(公告)日：1982-06-01
申请号：CA321417
申请日：1979-02-13
Applicant: IBM
Inventor： JUSTUS DENNIS J , SMITH GERALD L
Abstract: Method and apparatus for enabling measurement of corona drum current in an electrostatic copier as a maintenance aid. A rotatable drum supports a photoconductor with a conductive backing connected to a ground current return path including a slip ring. In the maintenance mode, the ground path is opened allowing drum current to flow through a current measuring circult including a pair of jacks to which a measurement device may be connected. The current measuring circuit also develops a potential which is representative of whether or not the current return path is grounded. This potential is coupled to a monitoring device where it may be used to drive a display. A method of aligning a corona generator employing the corona current measuring apparatus of the invention is applicable for aligning corona generators in situ in an electrostatic copier. The alignment method includes steps of energizing a selected corona generator, interrupting the normal ground return path, providing a current path from the photoconductor and coupling the current path to a measurement device. For alignment purposes at least two measurements are made, each measurement is made while different portions of the corona generator are masked. The measurements provide a measure of the corona current generated by two different portions of the generator which is useful in aligning the generator.
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公开(公告)号：CA1148238A
公开(公告)日：1983-06-14
申请号：CA364778
申请日：1980-11-17
Applicant: IBM
Inventor： PROMIS GEORGE G , SMITH GERALD L , WILSON JOHN C
Abstract: MOTOR DRIVING SYSTEM A motor driving system which is particularly useful for driving scanning carriages in a continuously variable reducing electrophotographic copier. The motor driving system produces one of a number of different controlled and repeatable position acceleration and velocity profiles of the scanning carriage with respect to motion of the copier drum; a different position acceleration and velocity profile is produced for each reduction mode in a substantially continuous range of reduction modes. The motor driving arrangement includes a single control loop for driving a servo motor which provides the drive for the scanning carriage. A driving signal source produces a driving signal pulse train, each pulse representing a desired increment of motor travel, and a direction signal representative of the desired direction of travel. A tachometer is responsive to servo motor motion and produces an output signal representative of the direction of motion; the output signal includes a series of tachometer pulses, each pulse representing a given increment of servo motor movement. A logic circuit couples the output of the tachometer, the driving signal pulse train and the direction signal to an up/down counter which is stepped in one direction for each driving signal pulse, and which is also stepped in another or one direction, respectively, for each tachometer pulse which represents a direction which is the same as or different from the direction of the direction signal. The output of the up/down counter, converted to analog form, provides an input signal to drive the servo motor. In order to control the acceleration, velocity and position profiles of the scanning carriage, the driving signal source produces a train of output pulses whose repetition rate is precisely controlled in relation to the motion of the drum. The driving signal source includes a counter which produces a pulse output BO979-004 each time a predetermined count is reached, the counter is stepped at a rate related to the velocity of the drum, and the repetition rate of the output pulses is controlled by providing a sequence of quantities, from a storage matrix, to alter the modulus of the counter in a predetermined pattern. BO979-004 BO979-004
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公开(公告)号：CA1117611A
公开(公告)日：1982-02-02
申请号：CA321418
申请日：1979-02-13
Applicant: IBM
Inventor： SMITH GERALD L
IPC: G01R19/175 , H03K5/1536 , H03K17/13
Abstract: TIGHT TOLERANCE ZERO CROSSING DETECTOR CIRCUIT A zero crossing detector provides an optically coupled output signal with a leading edge which occurs in the vicinity of the zero crossing point of an AC voltage waveform but no later than the zero crossing time. The circuit input includes a filter and rectifier. The filtered and rectified voltage is then applied to a complex impedance circuit with an input and an output, which provides an output lagging its input. A switching device, which may be a light emitting diode, is coupled between the output of the impedance circuit and the rectifier. Thus, when the lagging output voltage of the impedance circuit exceeds the output of the rectifier, the switching device conducts, producing the output signal.
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