A printing apparatus includes: a main body; a cover; a pair of supporters including a movable supporter; a first urging member configured to urge the movable supporter in an approach direction; an engaging member movable between a separated position and an engaged position; and a second urging member configured to urge the engaging member toward the engaged position. When the cover is in an open state, the engaging member is located at the engaged position by an urging force of the second urging member so as to inhibit movement of the movable supporter in the approach direction. When the cover is in a closed state, the engaging member is located at the separated position against the urging force of the second urging member by contact of the cover with the engaging member so as not to inhibit the movement of the movable supporter in the approach direction.

A sheet feeding device includes a sheet stacking base having a base surface for a sheet, a feeding member, and a pair of cursors. The pair of cursors includes first and second cursors that separate from and come close to each other along the sheet width direction, and is movable between first position and second position. The first and second cursors are separated by the maximum distance at the first position and by the minimum distance at the second position. The first cursor includes a movable base part, and a movable sub-cursor. When a narrow sheet is placed on the base surface, the sub-cursor is moved from the reference position toward the second cursor to be brought into contact with a side face of the narrow sheet to thereby position the narrow sheet.

A sheet support device includes a supporting portion, a first regulating unit, a second regulating unit, an electric fan, a duct, a cable, a fan-side holding portion, and a supporting portion-side holding portion. The duct is provided inside a first regulation plate, and air blown from the electric fan flows in the duct and is blown to a sheet supported by a supporting surface in a width direction. The cable connects to the electric fan. The fan-side holding portion secures a path of the cable in the width direction with respect to the electric fan. The supporting portion-side holding portion secures the path of the cable in the width direction with respect to the supporting portion. The supporting portion-side holding portion is positioned between two end portion imaginary planes orthogonal to the width direction at each of both end portions of a movement range of the fan-side holding portion.

A sheet stacking apparatus includes: a sheet stacking unit having a stacking surface on which a sheet is stacked; a sheet regulating unit including: a main body having a regulating surface which regulates a position of the sheet and being movable with respect to the sheet stacking unit; and an operating portion movably supported on a top of the main body and having a pressure surface, the operating portion being moved from a first position to a second position by performing a pressing operation on the pressure surface, the main body being regulated from moving when the operating portion is in the first position, and the main body being allowed to move when the operating portion is in the second position; and an opposed member removably supported on the main body and opposed to at least a part of the pressure surface and an upper surface of the operating portion.

A printing apparatus, having a body with a container compartment, a cover, a pair of supporting parts, a locking member, and an engaging portion, is provided. The pair of supporting parts support the roll along a first direction. At least one of the pair of supporting parts is movable in the first direction. The locking member is arranged on the movable supporting part and is movable between a locked position and an unlocked position. The engaging portion in the container compartment is engageable with the locking member being located at the locked position. The locking member at the unlocked position under the condition where the cover is open is separated from the engaging portion. The locking member contacts the cover and shifts from the unlocked position to the locked position to be engaged with the engaging portion in a process where the cover being open is moved to be closed.

A sheet storage cassette of the present disclosure includes a sheet storage portion, a rack and a cursor. The cursor aligns sheets. The cursor includes a regulation portion which makes contact with the side ends of the sheets and a lock portion which includes at least one engagement protrusion that engages with the rack teeth of the rack. The at least one engagement protrusion each includes a second inclination surface which is inclined from a tip end portion toward a base portion in a second direction opposite to a first direction. At least one of the engagement protrusions includes a second vertical surface which is extended vertically downward from the base portion toward the tip end portion. At least one of the engagement protrusions includes a third inclination surface which is inclined in the second direction and which is extended to the tip end portion of the engagement protrusion.

Disclosed is an adjustable paper blocking structure of a thermal printer, comprising: a base evenly provided with a plurality of tooth grooves; a paper blocking component slidably connected to the base and used to limit the two ends of label paper in the middle of the paper tray of the desktop thermal printer, and a locking component having one end rotatably connected to the paper blocking component and the other end engaging with the tooth groove. The proposed adjustable paper blocking structure of a thermal printer can be used for label papers of different sizes and improves printing accuracy.

An image reading apparatus includes a stacking portion, a feeding unit, a reading unit, and a discharge portion provided below the stacking portion. The feeding unit feeds a sheet stacked on the stacking portion in a feeding direction. The reading unit reads an image on the fed sheet and the discharge portion discharges the read sheet. The stacking portion includes first and second support surfaces that support the sheet and first and second regulating units to regulate a position of the sheet in a widthwise direction using two opposing ends of the sheet. The second support surface is retractable from a predetermined section above the discharge portion. The first support surface includes a downstream support portion that supports the sheet on a downstream side of the predetermined section in the feeding direction. A part of the second regulating surface is positioned on the downstream support portion.

A medium support tray includes a support part, an auxiliary support part that is provided expandably with respect to the support part and supports a medium together with the support part at an expanded position, a side end guide part that is provided at the support part and regulates a side end in an X axis direction of the medium supported by the support part, an auxiliary side end guide part that is provided at the auxiliary support part and regulates the side end of the medium supported by the auxiliary support part, and a coupling mechanism coupling the side end guide part and the auxiliary side end guide part. The side end guide part moves in the X axis direction in conjunction with movement of the auxiliary side end guide part in the X axis direction, and expandably guides the auxiliary support part via a coupling mechanism.

A paper conveying device includes a support shaft configured to pivotally support a roll of paper having a center measured in a width direction, a guide movable in the width direction of the roll based on a size of the roll and configured to position the center of the roll in a reference position, and a sensor coupled to the guide and configured to detect that the roll contains less than a threshold amount of paper based on a diameter of the roll.