Provided is an apparatus with automatic belt tensioning. A winding seat includes a first gear and a winding portion fixed at the first gear. A belt is windable around the winding portion, and the first elastic element is connected with the winding portion thus to wind the belt around the winding portion. A rotation preventing element includes a protrusion. When the protrusion retains the first gear, the winding portion is locked to prevent the belt being wound. When the belt is pulled, it drives the protrusion to be separated from the first gear and drives the winding portion to rotate. When the belt is released and the winding speed of the belt is decreased to a certain degree, the protrusion retains the first gear to prevent the belt being wound.

Provided is an image forming apparatus capable of obtaining a high deviation prevention capability while suppressing adhesion of paste to a side regulating member. A plurality of roller members, for example, an upstream side roller member 91 and a downstream side roller member 92 are disposed along a sheet conveyance direction in which a recording sheet is conveyed. Then, first side regulating members 94A and 94B are provided at both end parts of the upstream side roller member 91 in a fixed state, and also second side regulating members 95A and 95B are provided at both end parts of the downstream side roller member 92 in a rotatable state. The first side regulating members 94A and 94B and the second side regulating members 95A and 95B regulate the deviation of a roll sheet S by the contact with the edge parts of the roll sheet S.

The medium winding device includes a winding shaft, a drive unit for winding the medium around the winding member, a rotating member rotatably disposed, a tension applying member which moves as the drive unit is driven or stopped, a position detecting unit for detecting the position of the tension applying member, an output changing unit, a control unit that determines whether slippage occurs between the winding shaft and the winding member based on the position of the tension applying member and the result of output change by a rotation of the winding shaft. Further, the drive unit includes a torque limiter.

A label winding device is for receiving a medium including a label liner and a label member that is removably attached to the label liner and has at least one label portion and a waste portion, separating the waste portion from the label liner at a waste separation portion, and winding the at least one label portion with the label liner. The label winding device includes: a waste winder for winding the separated waste portion; a label winder for winding the at least one label portion with the label liner without the separated waste portion; a waste guide for guiding the separated waste portion to the waste winder; a support for rotatably supporting the waste guide; a sensor for detecting a rotational speed of the waste guide; and a waste break detector for detecting break of the waste portion on a basis of the detection by the sensor.

A printing apparatus including a transport guiding portion with high manufacturing yield, is provided. A printing apparatus includes a printing portion which is able to print on a medium, a transport portion which transports the medium, and a transport guiding portion on which a transport surface on which the medium is transported is formed and which has a plurality of bent portions, in which the transport guiding portion is provided with a first guiding member which has a bent portion and forms the transport surface on a transport direction upstream side of the medium and a second guiding member which has a bent portion and forms the transport surface on a transport direction downstream side of the medium.

A printing apparatus includes: a feeding shaft configured to support a roll body; a printing section configured to perform printing on a medium fed from the feeding shaft; a tension applying unit configured to come into contact with the medium after the medium is fed out from the feeding shaft and before the medium reaches the printing section, thereby applying tension to the medium; and a control unit, in which the tension applying unit includes: a tension bar configured to come into contact with the medium; an arm configured to support the tension bar and rotate to displace the tension bar; an encoder configured to detect a rotational angle of the arm; and a stopper configured to come into contact with the tension bar or the arm to restrict movement of the tension bar and the arm, and the control unit sets, as a reference angle of the arm, a rotational angle of the arm detected by the encoder in a state in which the tension bar or the arm is in contact with the stopper.

A belt-form body conveyor that conveys a belt-form body includes a plurality of non-contact guide portions over which portions of the belt-form body are wound, and that support the belt-form body in a non-contact manner, and a drive unit that, when viewed in a direction that is perpendicular to a surface of the belt-form body before the belt-form body is supplied to the plurality of non-contact guide portions, causes at least two non-contact guide portions out of the plurality of non-contact guide portions to rotate in the same direction and by the same angle.

A medium winding device for winding a continuous medium ejected from an image forming device includes a winding member that is rotatably arranged around which the medium is wound, an actuator that rotates the winding member to wind the medium on the winding member in a rolled state, a tension generation member that applies a tension to the medium being carried to the winding member, a roll diameter obtaining unit that obtains a roll diameter of the medium in the rolled state, wherein the roll diameter changes depending on an amount of the medium wound on the winding member, and a tension adjustment unit that adjusts the tension of the medium applied by the tension generation member depending on the roll diameter obtained by the roll diameter obtaining unit.

A medium supply apparatus supplying a rolled medium includes a tension member contacts to the medium to apply a tension to the medium, a state switching part that switches states of the tension member between first and second states, and a control unit. The tension member is swingable between a first position at which a first corner angle (1) and a second position at which a second corner angle (2) is formed, the second corner angle (2) being greater than the first corner angle (1). The control unit causes the state switching part to switch the state of the tension member to the fixed state in the first position when the medium is supplied, the control unit causes the state switching part to switch the state of the tension member to the releasing state in the first position when the control unit does not receive an image forming start signal for a predetermined period, and the control unit causes the state switching part to switch the state of the tension member to the fixed state when the tension member reaches the second position.

A meandering correction device for a roll medium includes: a first roll medium conveyance unit; a second roll medium conveyance unit disposed downstream of the first roll medium conveyance unit in a conveyance path for a roll medium; a meandering correction roller located between the first roll medium conveyance unit and the second roll medium conveyance unit in the conveyance path and being vertically downwardly in contact with the roll medium to thereby apply a tension to the roll medium. The meandering correction roller includes a rotational shaft whose direction is changeable. A change in the direction of the rotational shaft causes a position of the roll medium in contact with the meandering correction roller to move in the direction of the rotational shaft.