In an example of the disclosure, a driver correction specification is calculated based upon a time differential between a first sensor detection of a first portion of a leading edge of a media sheet and second sensor detection of a second portion of the leading edge. The driver correction specification is for causing skew correction of the media sheet as the media sheet moves along a media path to impact a blocker element. The driver is caused to operate according to the calculated driver correction specification.

A print medium feeding device comprises a pickup roller, a forward roller, a registration roller, a sensing unit, and a processor. The processor adjusts a first driving signal and a second driving signal based on a difference between a first time and a second time and controls driving of the registration roller using adjusted signals, the first driving signal adjusting a waiting position of the print medium in the registration roller, the second driving signal feeding the print medium waiting at the adjusted waiting position to the image forming unit, the first time associated with transport of the print medium from the pickup roller to the sensing unit, and the second time being measured by sensing the print medium transported from the pickup roller to the sensing unit.

A print medium feeding device comprises a pickup roller, a forward roller, a registration roller, a sensing unit, and a processor. The processor adjusts a first driving signal and a second driving signal based on a difference between a first time and a second time and controls driving of the registration roller using adjusted signals, the first driving signal adjusting a waiting position of the print medium in the registration roller, the second driving signal feeding the print medium waiting at the adjusted waiting position to the image forming unit, the first time associated with transport of the print medium from the pickup roller to the sensing unit, and the second time being measured by sensing the print medium transported from the pickup roller to the sensing unit.

A recoding medium conveying device includes a conveyance belt, a first sensor, a second sensor, and circuitry. The conveyance belt has an endless loop shape and a length capable of conveying a plurality of recording media in one rotation. The first sensor is disposed upstream from the conveyance belt in a conveyance direction of a recording medium and is configured to detect the recording medium. The second sensor is configured to detect a home position of the conveyance belt. The circuitry is configured to adjust a rotation speed of the conveyance belt, while the conveyance belt makes one rotation, to eliminate an amount of deviation between a first detection timing of the recording medium detected by the first sensor and a second detection timing of the home position of the conveyance belt detected by the second sensor.

A correction structure arranged in a feeding path of a document processing device, comprising: a transmitting means consisted of at least a pair of roller sets which are arranged symmetrically on the two sides of the feeding path for transmitting the card evenly, a correcting means consisted of a platform movably arranged at the downstream to the roller set, a receptacle formed on the platform, an elastic object arranged in the receptacle for returning the platform to a predefined location, a back wall extended from the platform toward the feeding path, an opening formed on the back wall to let a card go through, and a friction pad arranged at the bottom of the opening to partly jam the opening, wherein the width of the friction pad is less than the width of the feeding path so the friction pad only contacts the center of the card while transmitting the card.

A correction structure arranged in a feeding path of a document processing device, comprising: a transmitting means consisted of at least a pair of roller sets which are arranged symmetrically on the two sides of the feeding path for transmitting the card evenly, a correcting means consisted of a platform movably arranged at the downstream to the roller set, a receptacle formed on the platform, an elastic object arranged in the receptacle for returning the platform to a predefined location, a back wall extended from the platform toward the feeding path, an opening formed on the back wall to let a card go through, and a friction pad arranged at the bottom of the opening to partly jam the opening, wherein the width of the friction pad is less than the width of the feeding path so the friction pad only contacts the center of the card while transmitting the card.

The present subject matter relates to examples of adjusting the gaps between a first print medium and a second print medium. In one example, the first print medium may be picked by a pick-up roller from an input tray and may be conveyed to towards a transfer roller along a travel path. Further, according to the example, a homing position of the first print medium along the travel path may be determined. Once the homing position is determined, a second print medium may be picked by the pick-up roller. Further, a gap between a leading edge of the second print medium and a trailing edge of the first medium may be adjusted by regulating a rotational speed of the pick-up roller based on a rotational speed of the transfer roller.

A medium conveying apparatus includes a plurality of feed rollers, each feed roller rotating independently at a respective speed to feed a medium, a first sensor located on a downstream side of the plurality of feed rollers in a medium conveying direction and also in a central part in a direction perpendicular to the medium conveying direction, to detect the medium, a second sensor and a third sensor located on both sides of the first sensor in the direction perpendicular to the medium conveying direction, to respectively detect the medium, and a processor to change the speed of one of the plurality of feed rollers at least until the first sensor detects the medium when any of the second sensor or the third sensor detects the medium and the first sensor does not detect the medium within a predetermined time.

A medium conveying apparatus includes a plurality of feed rollers, each feed roller rotating independently at a respective speed to feed a medium, a first sensor located on a downstream side of the plurality of feed rollers in a medium conveying direction and also in a central part in a direction perpendicular to the medium conveying direction, to detect the medium, a second sensor and a third sensor located on both sides of the first sensor in the direction perpendicular to the medium conveying direction, to respectively detect the medium, and a processor to change the speed of one of the plurality of feed rollers at least until the first sensor detects the medium when any of the second sensor or the third sensor detects the medium and the first sensor does not detect the medium within a predetermined time.

A medium feeding device includes a storage unit that stores media in a form of a sheet, a delivery unit that is disposed downstream in a medium delivery direction relative to the media stored in the storage unit and that delivers the media individually, a transfer unit that is disposed above the storage unit and that sticks by suction to each of the media stored in the storage unit and transfers the media to the delivery unit individually, and a fluffing unit that is disposed beside the media stored in the storage unit in a direction intersecting the medium delivery direction. The fluffing unit fluffs an upper-side region of the media in a state of being separated by blowing air toward a side of the media. The medium feeding device further includes plural position detection units that are arranged in a region that is on the delivery unit side relative to a position of a downstream end portion, in the medium delivery direction, of each of the media stored in the storage unit and that does not reach a contact portion where the delivery unit comes into contact with the media. The position detection units are arranged at an interval in a width direction of the media intersecting the medium delivery direction. The position detection units detect a position of the downstream end portion, in the medium delivery direction, of each of the media.