A sheet can be securely drawn out of a sheet roll irrespective of an outer diameter of the sheet roll, and then, can be conveyed. A driven roller moves according to the outer diameter of the sheet roll, so as to be brought into press-contact with an outer periphery of the sheet roll from below, with respect to the direction of gravity, irrespective of the outer diameter of the sheet roll. An arm member moves according to the outer diameter of the sheet roll, so as to guide a lower side of the sheet drawn through above the driven roller irrespective of the outer diameter of the sheet roll.

A printer takes up slack in media while suppressing excessive rewinding, and can check the movement of a movable member that moves following change in tension on the media. The printer drives the supply motor in a first operating mode in a slack removal operation that rewinds the recording paper (media) onto a paper roll 2, and stops driving the supply motor when the tension lever (movable member) moves from a slack-side first position toward a second position. In the movement checking operation, the supply motor is driven in a second operating mode with greater output than the first operating mode, rewinds the recording paper on the paper roll, and sets the tension lever to the second position.

A printer takes up slack in media while suppressing excessive rewinding, and can check the movement of a movable member that moves following change in tension on the media. The printer drives the supply motor in a first operating mode in a slack removal operation that rewinds the recording paper (media) onto a paper roll 2, and stops driving the supply motor when the tension lever (movable member) moves from a slack-side first position toward a second position. In the movement checking operation, the supply motor is driven in a second operating mode with greater output than the first operating mode, rewinds the recording paper on the paper roll, and sets the tension lever to the second position.

There is provided a winding device, including: a winding part that winds a longitudinal recording medium in which an image is formed: a suppressing member that suppresses generation of a strain in the longitudinal recording medium wound by the winding part; and an operation part that operates the suppressing member in a case where the strain in the longitudinal recording medium wound by the winding part is a threshold value or more.

At a printer that feeds a continuous paper unwound from a paper sheet supply unit in a sheet-shape to a printing head portion side via a damper portion, and then prints on a label of the continuous paper, the damper portion is made of a transparent material.

Device and method for controlling axial forces acting upon a moving web comprises first, second and third rotatable rollers. The third roller is between the first and second rollers and is movable in a circular path in the vertical plane between lower and upper positions in response to axial forces acting at any moment upon the web. To enable a simple manual installation of the web, the upper position of the third roller is at a sufficient vertical distance above the first and second rollers to form an open horizontal passage through which the web can pass freely between the first and second rollers and the above-situated third roller. Axial forces are controlled by biasing the third roller with a force which counters the motion of the third roller in the direction of the upper working position and which is less than the ultimate tensile strength of the web.

Device and method for controlling axial forces acting upon a moving web comprises first, second and third rotatable rollers. The third roller is between the first and second rollers and is movable in a circular path in the vertical plane between lower and upper positions in response to axial forces acting at any moment upon the web. To enable a simple manual installation of the web, the upper position of the third roller is at a sufficient vertical distance above the first and second rollers to form an open horizontal passage through which the web can pass freely between the first and second rollers and the above-situated third roller. Axial forces are controlled by biasing the third roller with a force which counters the motion of the third roller in the direction of the upper working position and which is less than the ultimate tensile strength of the web.

A printer includes a medium supply unit, a printing unit, a feed unit, which feeds a print medium along a feed direction that is any one of a first direction toward the printing unit from the medium supply unit or a second direction toward the medium supply unit from the printing unit on a reference surface, a depressed portion, which is disposed using the reference surface as a reference, and a movement restricting portion, which includes a guide piece and restricts a movement of the print medium to a direction perpendicular to the feed direction of the print medium by housing at least a part of the guide piece in the depressed portion and abutting a side edge of the print medium on the guide piece, and a side edge on a side of the printing unit of the guide piece is disposed at a position close to an inner wall surface on the printing unit side of the depressed portion with respect to an inner wall surface on a side of the medium supply unit of the depressed portion.

An unwinding unit (400) for unwinding a strip (S) of heat sealing material for quadrangular machines (1) comprises a casing (401) adapted to be mounted on a quadrangular machine (1) and a puller (402) operatively associated with the casing (401) and configured to pull the strip (S) relative to the casing (401) along a feed path (P) and in a feed direction (V). A diverter (407) is configured to divert the strip (S) between an initial, preferably horizontal, stretch (P1) of the feed path and a final, substantially vertical stretch (P2) of the feed path, defining a curved, connecting stretch (P3) between the initial stretch and the final stretch. A deformer (413) operatively associated with the casing (401) are configured to make on the strip (5) an extended crease line (414) running along the strip itself starting from the curved stretch (P3) or downstream of the curved stretch (P3), in the feed direction (V) of the strip (S).

An unwinding unit (400) for unwinding a strip (S) of heat sealing material for quadrangular machines (1) comprises a casing (401) adapted to be mounted on a quadrangular machine (1) and a puller (402) operatively associated with the casing (401) and configured to pull the strip (S) relative to the casing (401) along a feed path (P) and in a feed direction (V). A diverter (407) is configured to divert the strip (S) between an initial, preferably horizontal, stretch (P1) of the feed path and a final, substantially vertical stretch (P2) of the feed path, defining a curved, connecting stretch (P3) between the initial stretch and the final stretch. A deformer (413) operatively associated with the casing (401) are configured to make on the strip (5) an extended crease line (414) running along the strip itself starting from the curved stretch (P3) or downstream of the curved stretch (P3), in the feed direction (V) of the strip (S).