A sheet supply apparatus detachably attached to an image forming apparatus is configured to receive a drive force from the image apparatus to supply sheet to the image forming apparatus. The sheet supply apparatus includes a sheet supply tray, a sheet supply roller, a first transmission mechanism configured to transmit a drive force from the image forming apparatus to the sheet supply roller, a second transmission mechanism including an output member and configured to transmit a drive force supplied from the image forming apparatus to the output member, a clutch mechanism configured to intermittently transmit a drive force from the image forming apparatus to the second transmission mechanism, a latch member pivotable between a restriction position and an allowance position, a change cam, a sector gear, a rotational force applying member, an engaging member, a first engagement portion, a second engagement portion, and an electromagnetic solenoid.

A sheet storage device includes a case, a lift plate, and a lift attachment. The lift attachment is fixed, in a detachable manner, to a central portion of the lift plate in a width direction. The lift attachment supports a lower surface of the sheets stacked on the lift plate at a position higher than the upper surface of the lift plate. The lift attachment includes a base portion and a pair of arm portions. The pair of arm portions are respectively formed to extend from an end portion of the base portion that is on a downstream side in the sheet feed direction, to opposite directions in the width direction.

The image forming apparatus includes a sheet storing unit insertably and pullably attached to the frame unit, an image forming unit, and a frame unit. The frame unit includes two frame members parallel to each other with a predetermined distance therebetween and are connected and fixed to each other. The two frame members respectively include engaged portions. The sheet storing unit includes engaging portions respectively engageable with the engaged portions in a state where the sheet storing unit is inserted in the frame unit. In a state where the engaging portions respectively engage with the engaged portions, the engaging portions that respectively engage with the engaged portions and a portion between the two engaging portions of the sheet storing unit serve as strengthening members to regulate deformation of the two frame members by at least a predetermined amount.

A removable media handling module includes a body that is horizontally slidable into and removable from an imaging apparatus. The media handling module includes a lower media guide extending between a front and a rear of the body. With the media handling module inserted into the imaging apparatus, the lower media guide is positioned parallel to and spaced from a corresponding upper media guide mounted in the imaging apparatus to form at least a portion of a duplex media path therebetween. A drive mechanism including a clutched gear is operably connected to a feed roll assembly of the media handling module. The clutched gear is freely rotatable in a first direction that causes the feed roll assembly to rotate in a media process direction for feeding a printed media sheet along the duplex media path and is restrained from rotating in a second direction opposite the first direction.

An image forming apparatus includes a main assembly including an image forming portion; a rotatable member capable of feeding a sheet and configured to rotate; and a detecting unit including an interrelating member configured to rotate in interrelation with rotation of the rotatable member, a detecting member configured to detect rotation of the interrelating member, and a holding member configured to integrally hold the interrelating member and the detecting member. The interrelating member, the detecting member and the holding member are integrally assembled into a unit. The detecting unit is detachably mountable to the main assembly.

A detector includes a first member that makes contact with an upper surface of a paper sheet stored in a sheet feeding cassette, and a second member that supports the first member such that it is capable changing postures, while also movably supporting the first member in an up-and-down direction to coincide with the upper surface of a paper sheet stored in the sheet feeding cassette. The first member has a guide portion that makes contact with the sheet feeding cassette and/or a paper sheet stored in the sheet feeding cassette. The first member changes postures with respect to the second member as a result of the guide portion making contact with the sheet feeding cassette and/or a paper sheet stored in the sheet feeding cassette.

An apparatus body includes a housing, a drawer, a push-out mechanism, and a positioner. The drawer is attachable to and detachable from the housing. The push-out mechanism pushes out the drawer by a predetermined amount from a setting position at which the drawer is positioned in the housing. The positioner positions the drawer at the setting position in the housing. The positioner includes a fitting hole disposed in one of the housing and the drawer and a positioning pin disposed in the other of the housing and the drawer. The positioning pin positions the drawer at the setting position in the housing in response to fitting of the positioning pin into the fitting hole. The positioning pin and the fitting hole each have a form that releases the fitting in response to pushing out of the drawer by the predetermined amount from the setting position.

An image forming apparatus configured to form images on a first surface and a second surface of a sheet includes an apparatus body, an image forming unit, a feed tray, and a return unit configured to return the sheet having an image formed on the first surface of the sheet toward the image forming unit. The return unit includes a first guide, a second guide, and an adjuster. The first guide is detachably attached to the second guide and includes a first roller and a positioned portion. The second guide is positioned in the apparatus body and includes a second roller facing the first roller, and a positioning portion configured to contact the positioned portion of the first guide, thereby positioning the first guide relative to the second guide. The adjuster is configured to adjust an orientation of the second guide relative to the apparatus body.

An image forming apparatus includes an apparatus main body and a feed device. The feed device is detachably attached to the apparatus main body and feeds a recording medium. The apparatus main body includes an image forming section and a main body frame. The image forming section forms an image on the recording medium. The main body frame supports the image forming section. The main body frame has a first positioning hole and a second positioning hole. The feed device includes positioning protrusions. When the respective positioning protrusions are fitted into the first and second positioning holes, a relative positional relationship between the main body frame and the feed device is determined.

An article of manufacture for providing a printer paper tray easy-swap paper lift is disclosed. The easy swap paper lift includes a pair of side edges configured to slide with the pair of guide slots are cut into the opposing inner side walls of the paper tray, a rigid surface coupled to the pair of guide slots extending outward to engage under an outer end of a stack of paper within the paper tray, and a pair of lift tabs coupled to a top surface of the pair of guide slots extending outward from the opposing side walls of the paper tray, the pair of lift tabs raise the stack of paper.