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1. IN201947018439 - USAGE DETERMINATION OF MULTI-FEED PREVENTION ROLLER

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[ EN ]
1 ] A sheet feeding apparatus comprising:a sheet slacker to stack at least one sheet;a sheet feed roller disposed at one side of the sheet stacker and to feed a sheet fed from the sheet stacker;a multi-feed prevention roller disposed to face the sheet feed roller and to prevent multi-feed of sheets fed from the sheet stacker; a magnetic torque limiter disposed coaxiatly with the multi-feed prevention roller;a hall sensor disposed at one side of the magnetic torque limiter and lo delect a rotation and a rotational direction of the magnetic torque limiter; anda controller to control rotation of the sheet feed roller in a state in which the sheet feed roller and the multi-feed prevention roller are in contact with each other without a sheet and to determine a value in-dicative of usage corresponding to the multi-feed prevention roller according to a signal indicative of the delected rotation and rotational direction of the magnetic torque limiter output from the hall sensor.[Claim 21 The sheet feeding apparatus of claim 1, whereinihe magnetic torque limiter comprises:a plurality of permanent magnets provided circumfcrentially on a rolalion shaft of Ihe multi-feed prevention roller; a housing lo surround the plurality of permanent magnets; and a magnetic member provided on an inner circumferential surface of the housing and facing the plurality of permanent magnets, wherein a portion of the hosing facing the hall sensor is provided with a magnetic force emitting region through which a magnetic force of each of the plurality of permanent magnets is radiated to an outside of the housing over an entire circumference of the housing to cause the detection of the rotation and the rotational direction of the magnetic torque limiter by the hall sensor.[Claim 3] The sheet feeding apparatus of claim 2, whereina length of the magnetic member is smaller than a length of each of the plurality of permanent magnets, andwherein the magnetic force emitting region does not overlap with the magnetic member and is formed as a portion of the housing facing the plurality of permanent magnets. [Claim 4] The sheet feeding apparatus of claim 2. whereinthe magnetic member includes a plurality of slits provided in a circum-ferential direction, andwherein the magnetic force emitting region is formed as a portion of the housing corresponding to the plurality of slits of the magnetic member.[Claim 5] The sheet feeding apparatus of claim 1, whereinthe hall sensor comprises two hall sensors provided in a circumferential direction of the magnetic torque limiter.[Claim 6] The sheet feeding apparatus of claim 1, whereinthe hall sensor comprises a hall IC sensor in which two hall sensors are integrated.[Claim 7] The sheet feeding apparatus of claim 1, further comprising:a pickup roller to pick up the at least one sheet stacked on the sheet slacker;a sheet feed motor to rotate at least one or a combination of the pickup roller, the sheet feed roller, or the multi-feed prevention roller; a sheet feed clutch to selectively transmit a rotational force of the sheet feed motor to the sheet feed roller; anda pickup clutch to selectively transmit the rotational force supplied from the sheet feed clutch to the pickup roller, wherein when determining the value corresponding to the multi-feed prevention roller, the controller is to, control driving the sheet feed motor,control the sheet feed clutch and the pickup clutch so that the sheet feed roller is rotated by the rotational force of the sheet feed motor and the pickup roller is blocked from picking up the sheet, and determine the value indicative of the usage corresponding to the multi-feed prevention roller according to the signal indicative of the detected rotation and rotational direction of the magnetic torque limiter output from the hall sensor, in response to the rotation of the multi-feed prevention roller.[Claim 8] The sheet feeding apparatus of claim 7, whereinthe controller is to further,compare a number of rotations of the sheet feed roller and a number of rotations of the multi-feed prevention roller, and determine that the value indicative of the usage corresponding to the multi-feed prevention roller further indicates a lifetime of the multi- feed prevention roller is over, when a difference between the number of rotations of the multi-feed prevention roller and the number of rotations of the sheet feed roller is larger than a reference number of rotations,[Claim 9J The sheet feeding apparatus of claim 7, whereinthe controller is to further.determine that the value indicative of the usage corresponding to the multi-feed prevention roller further indicates a lifetime of the multi-feed prevention roller is over, when an interval between two adjacent pulse signals among a plurality of pulse signals corresponding to one rotation of the multi-feed prevention roller output form the hall sensor is larger than a reference pulse interval.[Claim 10J The sheet feeding apparatus of claim 1, further comprising:a pickup roller to pick up the at least one sheet stacked on the sheetstacker;a sheet feed motor to rotate at least one or a combination of the pickuproller, the sheet feed roller, or the multi-feed prevention roller;a sheet feed clutch to selectively transmit a rotational force of the sheetfeed motor to the sheet feed roller; anda pickup clutch to selectively transmil the rotational force suppliedfrom the sheet teed clutch to the pickup roller,wherein the controller is to,control driving the sheet feed motor,control the sheet feed clutch so that the rotational force of the sheetfeed motor is blocked from transmitting to the sheet feed roller, anddetermine a state of a joint that couples (he magnetic torque li miter tothe sheet feed motor, by using the signal output from the hall sensor,[Claim 11J The sheet feeding apparatus of claim 1, further comprising:a pickup roller to pick up the at least one sheet stacked on the sheet stacker;a sheet feed motor to rotate the pickup roller and the sheet feed roller; a sheet feed clutch to selectively transmit a rotational force of the sheet feed motor to the sheet feed roller; anda pickup clutch to selectively transmit the rotational force supplied from the sheet feed clutch to the pickup roller, wherein when determining the value indicative of the usage corre¬sponding to the multi-feed prevention roller, the controller drives the sheet feed motor, controls the sheet feed clutch and the pickup clutch so that the sheet feed roller is rotated by the rotational force of the sheet feed motor and the pickup roller is blocked from picking up the sheet, and determines the value using the signal output from the hall sensor.[Claim 12J The sheet feeding apparatus of claim 1I, whereinthe controller is lo further.compare a number of rotations of the sheet feed roller and a number of rotations of the multi-feed prevention roller, and determine that the lifetime of the multi-feed prevention roller further indicates a lifetime of the multi-feed prevention roller is over when a difference between the numher of rotations of (he multi-feed prevention roller and the number of rotations of the sheet feed roller is larger than a reference number of rotations.[Claim 13} The sheet feeding apparatus of claim II, whereinthe controller is to further,determine that the value indicative of the usage corresponding to the multi-feed prevention roller further indicates a lifetime of the multi-feed prevention roller is over, when an interval between two adjacent pulse signals among a plurality of pulse signals corresponding to one rotation of the multi-feed prevention roller output form the hall sensor is larger than a reference pulse interval.[Claim 14] An image forming apparatus comprising:a main body including an image former;at least one sheet feeding apparatus to feed a sheet to the image former; anda controller to control the image former and the at least one sheet feeding apparatus lo form an image on the sheet, wherein the at least one sheet feeding apparatus includes; a sheet slacker to stack at least one sheet;a sheet feed roller disposed at one side of the sheet stacker and Lo feed a sheet Ted from the sheet stacker to the image former; a multi-feed prevention roller disposed to face the sheet feed roller and configured to prevent multi-feed of sheets fed from the sheet stacker; a magnetic torque limiter disposed coaxially with the multi-feed prevention roller; anda hall sensor disposed at one side of the magnetic torque limiter and lo delect a rotation and a rotational direction of the magnetic torque limiter, and wherein the controller is to, control to determine a value indicative of usage corresponding to themulti-feed prevention roller according to a signal indicative of thedelected rotation and rotalional direction of the magnetic torque limileroutput from the hall sensor.[Claim 15] The image forming apparatus of claim 14. whereinthe controller is configured to rotate the sheet feed roller in a state in which the sheet feed roller and the multi-reed prevention roller are in contact with each other without the sheet and to identify a lifetime of the mulli-feed prevention roller according to the determined value.54