公开(公告)号：US09954468B2

公开(公告)日：2018-04-24

申请号：US14081524

申请日：2013-11-15

Applicant: S-PRINTING SOLUTION CO., LTD.

Inventor： Hyoung-il Kim ,  Yong-ho You ,  Seong-ho Shin ,  Young Jung Yun ,  Tae-young Kim ,  Geon-hoon Kim ,  Ho-bin Hwang ,  Ji-young Byun

IPC: H02P6/16 ,  H02P6/08 ,  H02P6/34

CPC classification number: H02P6/08 ,  H02P6/06 ,  H02P6/34 ,  H02P23/0004 ,  H02P23/22

Abstract: An image forming apparatus includes an engine unit to perform an image forming job; an engine control unit to control the operation of the engine unit; a brushless direct current (BLDC) motor to drive the engine unit; a sensor unit to sense electric angle information and driving velocity information of the BLDC motor; a communication interface to receive a digital control command with respect to the BLDC motor from the engine control unit; a driving signal unit to generate a driving signal to control the BLDC motor; and a digital control unit to control the operation of the driving signal unit in a digital phase locked loop (PLL) manner for feedback controls the BLDC motor, based on the received digital control command, the detected electric angle information and the driving velocity information and a digital gain value as a control factor with respect to the BLDC motor.

公开(公告)号：US10209662B2

公开(公告)日：2019-02-19

申请号：US15392062

申请日：2016-12-28

Applicant: S-PRINTING SOLUTION CO., LTD.

Inventor： Ji-young Byun ,  Sung-dae Kim ,  Young-jung Yun

IPC: H04N1/00 ,  G03G15/00

Abstract: A scanner apparatus includes a document feeding path in which a reading device configured to read an image from a document is provided, a first registration roller configured to feed the document along the document feeding path, and located at an upstream side of the reading device based on a feeding direction of the document, a second registration roller aligned with the first registration roller in a width direction of the document, and located spaced apart from the first registration roller in the width direction, a registration motor configured to drive the first registration roller, and a main motor configured to drive the second registration roller.

公开(公告)号：US10171017B2

公开(公告)日：2019-01-01

申请号：US14177433

申请日：2014-02-11

Applicant: S-PRINTING SOLUTION CO., LTD.

Inventor： Yong-ho You ,  Hak-young Kim ,  Ji-young Byun ,  Sang-hyuk Jung ,  Ho-bin Hwang

IPC: H02P27/08 ,  H02P6/12 ,  H02P6/14 ,  H02P8/38 ,  H02P8/12

Abstract: An image forming apparatus may include an engine portion used to perform an image forming job, a step motor configured to start the engine portion, a driver including a resistor that measures current that flows to a coil of the step motor and is configured to provide a predetermined constant current to the step motor, and a drive controller configured to measure a load level of the step motor based on a voltage value of the resistor and to control the driver to provide the constant current that corresponds to the measured load level.