The measured winding diameter values Ds1(d) corresponding to the conveying distance d are measured by measuring the diameter of the printing medium M wound on the unwinding roll 71 by the diameter sensor 77. The measured winding diameter values Ds1(d) are smoothed by the low-pass filter to extract the smoothed winding diameter values Ds_avg1(d). By calculating the value of the diameter based on the initial diameter value Do1, the thickness value Tm and the conveying distance of the printing medium M, the calculated winding diameter values Dc1(d) are calculated. An operation of calculating the difference Ddiff1(d) between the calculated winding diameter value Dc1(d) and the smoothed winding diameter value Ds_avg1(d) while compensating for the delay by the low-pass filter is performed whereby the differences Ddiff1(d) are calculated. The calculated winding diameter value Dc1(d) are corrected by the differences Ddiff1(d).

A printer includes a conveyor to convey a tape having a plurality of marks in a conveyance direction, the marks including a first mark, and a second mark formed downstream of the first mark in the conveyance direction, a print head to print an image on the tape, a reflection sensor to detect the marks on the tape by emitting light toward the tape and receiving reflected light from the tape, and output a detection signal according to the reflected light when detecting the marks, and a controller. The controller is configured to set a threshold to be variable based on a level of the detection signal when the reflection sensor detects the second mark, and identify a position of the first mark based on a result of comparison between the threshold and a level of the detection signal when the reflection sensor detects the first mark.

The printing medium M after color printing is performed on the front surface M1 (recording surface) by the color printing unit 32 can be conveyed while the front surface M1 and the back surface M2 of the printing medium M are inverted twice by the only rollers 471 to 478 (rotary bodies) in contact with the back surface M2 (non-recording surface) of the printing medium M (inverting conveying part 47). In this way, without providing air turn bars, a time to convey the printing medium M from the color printing unit 32 to the white printing unit 33 can be secured while the printing medium M is firmly supported by the rollers 471 to 478 in contact with the back surface M2 of the printing medium M.

A recording device includes a recording unit capable of performing recording on a medium, a holding unit capable of holding a roll body around which the medium is wound, a transporting unit that transports the medium unwound from the roll body, a tension roller that, between the holding unit and the recording unit, comes into contact with a back surface of the medium and applies tension to the medium, and a blowing unit that blows air onto a front surface of the medium. The blowing unit blows the air towards the tension roller.

A printing apparatus includes a printing unit that performs printing on a printing medium, a transporting belt that transports the printing medium and has an endless shape, and a belt-driving roller that causes the transporting belt to circulate and has a cylindrical shape. In the transporting belt, a magnetic scale having a magnetic pole changing at a predetermined pitch is arranged along a transport direction of the printing medium. The belt-driving roller includes an outer circumferential surface constituted of a magnet body, and is in contact with the transporting belt at the outer circumferential surface. The circumferential length of the outer circumferential surface of the belt-driving roller is an integer multiple of the pitch of the magnetic scale.

Included are a feeding shaft configured to hold a printing medium, a first transporting belt, a second transporting belt, a first driving roller on which the first transporting belt is wound, a second driving roller on which the second transporting belt is wound, a first driving unit configured to drive the first driving roller, a second driving unit configured to drive the second driving roller, a winding roller on which the printing medium is wound, a first winding roller bearing, a second winding roller bearing, a first load cell configured to detect a load exerted by the printing medium on the first winding roller bearing, a second load cell configured to detect a load exerted by the printing medium on the second winding roller bearing, and a control unit configured to control the first driving unit and the second driving unit based on detection results of the load cells.

A liquid discharge apparatus includes: a casing having: a first surface and a second surface positioned apart in a first direction; a third surface and a fourth surface positioned apart in a second direction; and a fifth surface and a sixth surface positioned apart in a third direction; a head; a tank storing a liquid to be supplied to the head; and a sheet accommodating portion accommodating a sheet. The tank is positioned between the first surface and the sheet accommodating portion in the first direction. A range occupied by the tank at least partially overlaps with a range occupied by the sheet accommodating portion in the second direction. A range occupied by the tank at least partially overlaps with a range occupied by the sheet accommodating portion in the third direction.

A recording apparatus is configured to support a roll body on which a medium is wound in a rolled form, and to perform recording on the medium fed out from the roll body, the recording apparatus including a housing, and a roll unit configured to support the roll body, in which the roll unit is configured to transition to a first mode in which the roll unit is stored inside the housing in a state of not supporting the roll body, and to a second mode in which the roll unit is drawn out from inside the housing to outside the housing where the roll unit is configured to support the roll body

A sheet conveyor includes: a holder that detachably holds a sheet roll; a rotation measuring device that measures a rotation amount of the sheet roll; a conveyance roller that conveys a sheet pulled out from the sheet roll held by the holder; a tensioner that is provided between the holder and the conveyance roller and that contacts with the sheet pulled out from the sheet roll toward the conveyance roller; a position detector that detects a position of the tensioner; a motor that generates driving force for rotating the conveyance roller; and a controller that controls the motor. The controller estimates a diameter of the sheet roll based on a conveyance amount of the sheet caused by rotation of the conveyance roller, a rotation amount of the sheet roll measured by the rotation measuring device, and a position of the tensioner detected by the position detector.

In accordance with an embodiment, a magnetic ink reading device comprises a conveyance mechanism configured to convey a sheet-like medium printed by using magnetic ink along a conveyance path; a magnetizing mechanism configured to magnetize the magnetic ink on the medium along the conveyance path; a magnetic detection head, arranged in the vicinity of the magnetizing mechanism along the conveyance path, configured to read magnetism of the magnetized magnetic ink; a cylindrical roller member, arranged to face the magnetic detection head across the conveyance path, configured to press the medium conveyed along the conveyance path against the magnetic detection head to be capable of rotating along the surface of the medium; and a rotating shaft configured to rotatably support the roller member and contact an inner wall of the roller member at the axial center of the roller member.