An example system includes an advancement mechanism to drive print media into a stacking region, a movable media guide arrangement and a controller. The movable media guide arrangement includes a pair of opposing media guides to receive opposing edges of a print medium therein and a translation mechanism to move the opposing media guides between at least two positions, the at least two positions including a deployed position and a retracted position. The controller is to actuate the translation mechanism to move the opposing media guides into the deployed position when the advancement mechanism transports a print medium into the stacking region and to actuate the translation mechanism to move the opposing media guides to the retracted position to release the print medium.

There is provided a sheet storage device including a regulation unit that includes a first contact portion configured to contact a stacking unit, and a second contact portion configured to contact a facing member. The first contact portion contacts the stacking unit in a state of being urged toward the stacking unit. The second contact portion contacts the facing member in a state of being urged toward the facing member.

An attachment capable of being attached, in a detachable manner, to an accommodation part of a printing apparatus which is for accommodating a print medium, the attachment being configured to support a roll including the print medium which is wound, the attachment including: a housing having a substantially box shape of which an upper part is opened, the housing being configured to accommodate the roll inside thereof in a replaceable manner; an engaging part provided to the housing and configured to engage, in a disengageable manner, to an engaged part provided to the accommodation part when the housing is attached to the accommodation part; and a support part provided to the housing and configured to rotatably support the roll.

An image forming apparatus includes a stack portion on which a sheet is to be stacked, a regulating portion, a first detection device which includes a rotary variable resistor, a second detection, and a control unit. The regulating portion regulates a position of an edge of the stacked sheet. The first detection device outputs a detection signal based on the rotary variable resistor. The rotary variable resistor rotates in accordance with the sheet edge position regulated by the regulating portion. The second detection device detects presence or absence of the stacked sheet. The control unit calculates a calculated sheet width of the stacked sheet based on the output detection signal. The control unit sets the calculated sheet width after a first predetermined time has elapsed since the second detection device detects that the sheet is stacked on the stack portion as a detected sheet width of the stacked sheet.

There is provided a sheet storage device including a regulation unit that includes a first contact portion configured to contact a stacking unit, and a second contact portion configured to contact a facing member. The first contact portion contacts the stacking unit in a state of being urged toward the stacking unit. The second contact portion contacts the facing member in a state of being urged toward the facing member.

A sheet feeding apparatus includes a supporting portion, a feeding portion, a regulation unit, and a sensor. The supporting portion configured to support a sheet. The feeding portion configured to feed the sheet supported by the supporting portion. The regulation unit configured to regulate a position of an edge portion of the sheet supported by the supporting portion. The sensor configured to output an output value that changes in accordance with an amount of movement of the regulation unit in the moving direction. The sensor is disposed above the supporting portion and the regulation portion in a gravity direction, and above an abutment position between the sheet supported by the supporting portion and the feeding portion in the gravity direction.

A printing device includes a first support portion, a second support portion movable in a moving direction of the second support portion toward and away from the first support portion, a movable probe movably supported by a detector, and a permission mechanism. The movable range consists of a first range and a second range. The permission mechanism is configured to permit the movable probe to move in accordance with the movement of the second support portion in the separating/approaching direction relative to the first support portion in a case where the movement of the second support portion is within the first range, and is also configured to prevent the movable probe from moving irrespective of further movement of the second support portion relative to the first support portion in a case where the movement of the second support portion is within the second range.

A document transport device includes a placement portion, a slide member, a movable piece, and a detector. A document is to be placed on the placement portion. The slide member includes a document guide that contacts one lateral side of the document which is placed on the placement portion. The movable piece is provided to the slide member, and includes a shading pattern composed of plural patches that have plural densities corresponding to plural document sizes and having plural adjacent patch density differences that are different from each other. The detector detects a density of the shading pattern, and outputs an output signal for document size recognition.

A sheet supporting apparatus includes a sheet supporting portion, a regulating portion, and a positioning unit, wherein the positioning unit includes first and second teeth portions provided on the sheet supporting portion, a third teeth portion provided on the regulating portion and being capable of transiting to a first state and to a second state, a fourth teeth portion provided on the regulating portion and being capable of transiting to a third state and to a fourth state, and an operating portion configured to cause a force which the fourth teeth portion receives from the second teeth portion to act as a force in a direction in which the third teeth portion engages with the first teeth portion.

A printing device includes a holder including: a first movable portion including a first support portion; a second movable portion including a second support portion; a pinion; a spring; an adjustment screw; a handle rotatable with the adjustment screw; and a stopper threadingly engaged with the adjustment screw. The first movable portion is movable in a first direction and a second direction opposite the first direction. The second movable portion is movable in the first direction and the second direction in accordance with movement of the first movable portion in the second direction and the first direction. The handle is positioned outside of a region defined between the first and second support portions positioned remotest from each other in the first direction. The stopper is in abutment with one of the first and second movable portions to restrict movements of the first and second movable portions.