A media feeding apparatus includes a media mounting section, a first feed roller, a media pressing section for pressing media sheets against the first feed roller, and a pressing force adjuster for adjusting the pressing force of the media pressing section. The controller sets the pressing force of the media pressing section to first pressing force and drives the first feed roller and the second feed roller in a forward rotation direction, and in a case in which the first detector detects a passage of a leading edge of the media sheet and the second detector detects no passage of the leading edge of the media sheet after predetermined first set time has passed, the controller continues the rotation of the first feed roller and the second feed roller with second pressing force of the media pressing section greater than or equal to the first pressing force.

A medium conveying device includes a driving roller configured to apply a driving force to a medium to convey the medium, a first driven roller configured to press the medium toward the driving roller, and a second driven roller arranged upstream of the first driven roller in a conveying direction of the medium, and that is configured to contact the medium entirely in an intersecting direction intersecting the conveying direction to press the medium toward the driving roller, wherein a contact portion of the second driven roller contacting the medium includes a material configured to adsorb a plasticizer of the medium, and a pressing force of the second driven roller is weaker than a pressing force of the first driven roller.

Provided are: a sheet feed device that is capable of suppressing the occurrence of a sheet feeding fault by changing the pressing contact force of a retard roller against a feed roller; and an image formation device equipped with the same. This sheet feed unit (50) is provided with: a pickup roller (29); a feed roller (31); a retard roller (32); a holding member (40) that holds the retard roller (32); a first biasing member (42) that biases the holding member (40); and a pressing contact force changing mechanism (60) that changes the pressing contact force of the retard roller (32) against the feed roller (31). The pressing contact force changing mechanism (60) has: a rotary shaft (61) disposed parallel to the axial direction of the retard roller (32); a cam member (70) that rotates with the rotary shaft (61); and a movable member (80) that contacts the cam member (70), moves in the axial direction in conjunction with the rotation of the cam member (70), and changes the biasing force generated by the first biasing member (42).

A print medium feeding device includes a guide unit; a first conveyance unit that applies first conveyance force F1 to the print medium, a first part of the first conveyance force applying section moving at a first linear velocity V1; a second conveyance unit including a second conveyance force applying section that makes contact with the print medium and applies second conveyance force F2 to the print medium, a second part of the second conveyance force applying section moving at a second linear velocity V2; and a third conveyance unit including a third conveyance force applying section that makes contact with the print medium and applies third conveyance force F3 to the print medium, a third part of the third conveyance force applying section moving at a third linear velocity V3, wherein V2>V3>V1 and F3>F1>F2 are satisfied.

A conveyance device includes a sheet stacker, a pickup roller, a feed roller, a first drive source, a first encoder, a first drive controller, a separation roller, a second drive source, a second encoder, a second drive controller, a separation pressure provider, and a torque estimation device. The torque estimation device estimates a torque of the second drive source with an applied voltage to the second drive source from the second drive controller after calculating a turning angle speed from a rotation amount of the second drive source detected by the second encoder based on a relational expression between a motor rotation speed and an applied voltage that are measured beforehand for the second drive source and a torque of the second drive source.

There is provided a printing apparatus including: a recorder; first and second conveying rollers; a first member which includes the first conveying roller and in which the first conveying roller is supported shakably; and a second member which includes the second conveying roller. The first member includes: a roller support having: an extending part which extends in an extending direction of a rotation shaft of the first conveying roller, and first and second supports which rotatably supports first and second ends of the rotation shaft of the first conveying roller, respectively; and at least one pressing part configured to press a central area of the extending part in a pressing direction extending from the first conveying roller to the second extending roller, in a state that the first and second conveying rollers are brought into contact with each other.

A media feeding apparatus includes a media mounting section, a first feed roller, a media pressing section for pressing media sheets against the first feed roller, and a pressing force adjuster for adjusting the pressing force of the media pressing section. The controller sets the pressing force of the media pressing section to first pressing force and drives the first feed roller and the second feed roller in a forward rotation direction, and in a case in which the first detector detects a passage of a leading edge of the media sheet and the second detector detects no passage of the leading edge of the media sheet after predetermined first set time has passed, the controller continues the rotation of the first feed roller and the second feed roller with second pressing force of the media pressing section greater than or equal to the first pressing force.

Provided are: a sheet feed device that is capable of suppressing the occurrence of a sheet feeding fault by changing the pressing contact force of a retard roller against a feed roller; and an image formation device equipped with the same. This sheet feed unit (50) is provided with: a pickup roller (29); a feed roller (31); a retard roller (32); a holding member (40) that holds the retard roller (32); a first biasing member (42) that biases the holding member (40); and a pressing contact force changing mechanism (60) that changes the pressing contact force of the retard roller (32) against the feed roller (31). The pressing contact force changing mechanism (60) has: a rotary shaft (61) disposed parallel to the axial direction of the retard roller (32); a cam member (70) that rotates with the rotary shaft (61); and a movable member (80) that contacts the cam member (70), moves in the axial direction in conjunction with the rotation of the cam member (70), and changes the biasing force generated by the first biasing member (42).

A sheet conveying device includes a pair of rollers, a biasing member, a guide member, a biasing support, and a biasing force changer. The pair of rollers includes a first roller and a second roller disposed in contact with the first roller. The pair of rollers is configured to hold a sheet between the first roller and the second roller. The biasing member is configured to bias the first roller toward the second roller. The biasing support is configured to support the biasing member and has a guide target member configured to slide along the guide member to move the biasing support. The biasing force changer is configured to change a biasing force of the biasing member along with movement of the biasing. support. The guide target member has a portion projecting into a sheet conveyance passage through which the sheet is conveyed by the pair of rollers.

A layer transfer device configured to transfer at least one layer of a multilayer film onto a toner image includes: a sheet conveying unit; a supply reel; a wind-up reel; a film transfer unit; and a peeling roller disposed between the film transfer unit and the wind-up reel in a conveyance path and configured to peel off the multilayer film from a sheet, and the film transfer unit includes: a first roller provided to contact the sheet; and a second roller provided to contact the multilayer film, and a tangent line of the second roller at a downstream end of a nip part passes between a center of the second roller and a center of the peeling roller, and an angle formed by the tangent line and a film tension portion of the multilayer film tensed between the nip part and the peeling roller is 15 to 37 degrees.