Medium winding device and printing system

Patent metadata

Field	Value
Publication number	US-2018282096-A1
Application number	US-201815920994-A
Country	US
Kind code	A1
Filing date	Mar 14, 2018
Priority date	Mar 31, 2017
Publication date	Oct 4, 2018
Grant date	—

Abstract

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.

First claim

1 . A medium winding device, comprising:
a winding member which winds the medium in a roll is detachably disposed with respect to a winding shaft; a drive unit that gives a rotation drive to the winding shaft, includes a winding motor and a drive transmission unit; a tension applying member that is disposed so as to be movable along a guide on the upstream side of the winding member in a conveyance direction of the medium, moves along the guide while being in contact with the medium to be conveyed, provides tension to the medium to be conveyed; a rotating member that is disposed between the winding member and the tension applying member in the conveyance direction of the medium, guides the medium in the conveyance direction of the medium; a position detecting unit that detects a position of the tension applying member; an output changing unit with an output that varies according to a rotation of the winding shaft; and 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 a result of output change by the rotation of the winding shaft, wherein, the drive unit includes a torque limiter that idles when torque equal to or greater than a limit torque is applied.

2 . The medium winding device according to claim 1 , wherein
when a roll medium having a maximum diameter is formed on the winding member, the limit torque is set to be larger than a torque required for rotating the winding member.

3 . The medium winding device according to claim 1 , wherein
the tension applying member reciprocates between a lower position and an intermediate position as the drive unit is driven or stopped.

4 . The medium winding device according to claim 3 , wherein
the output changing unit is a speed detecting unit that detects a rotation speed of the winding shaft.

5 . The medium winding device according to claim 4 , wherein;
the position detecting unit detects a position of the tension applying member moving along the guide, the control unit reads the rotation speed of the winding shaft detected by the speed detecting unit, determines a state as to whether or not the winding shaft is stopped, the control unit reads the position of the tension applying member detected by the position detecting unit, determines a state as to whether or not the tension applying member is moved to an upper position above the intermediate position, the control unit determines whether slippage occurs between the winding shaft and the winding member based on a state of the winding shaft and a state of the tension applying member.

6 . The medium winding device according to claim 5 , wherein the upper position is defined as a position of the tension applying member such that the medium extends linearly between a discharge port of a printer and an idle roller.

7 . The medium winding device according to claim 6 , wherein
the control unit determines that there is no slippage between the winding shaft and the winding member when the winding shaft is stopped and the tension applying member is moved to the upper position.

8 . The medium winding device according to claim 6 , wherein
the control unit determines that slippage occurs between the winding shaft and the winding member when the winding shaft is rotating and the tension applying member is moved to the upper position.

9 . The medium winding device according to claim 6 , wherein
the control unit determines that slippage occurs between the winding shaft and the winding member when the winding shaft is rotating and the tension applying member is not moved to the upper position until the predetermined time elapses.

10 . The medium winding device according to claim 1 , wherein the output changing unit is a speed sensor, and
wherein the speed sensor detects the rotation speed of the winding shaft.

11 . A medium winding device, comprising:
a winding member which winds the medium in a roll is detachably disposed with respect to a winding shaft; a drive unit that gives a rotation drive to the winding shaft, includes a winding motor and a drive transmission unit; a tension applying member that is disposed so as to be movable along a guide on the upstream side of the winding member in a conveyance direction of the medium, moves along the guide while being in contact with the medium to be conveyed, provides tension to the medium to be conveyed; a rotating member that is disposed between the winding member and the tension applying member in the conveyance direction of the medium, guides the medium in the conveyance direction of the medium; a position detecting unit that detects a position of the tension applying member; an output changing unit with an output that varies according to a rotation of the winding shaft; and a control unit that eliminates looseness occurring in the roll medium formed by winding the medium on the winding member based on the position of the tension applying member and a result of output change by the rotation of the winding shaft, wherein the drive unit includes a torque limiter that idles when torque equal to or greater than a limit torque is applied.

12 . A printing system comprising a printing apparatus and a medium winding device for winding up a medium discharged from a discharge port of the printing apparatus,
wherein the medium winding device comprises:
a winding member which winds the medium in a roll is detachably disposed with respect to a winding shaft;
a drive unit that gives a rotation drive to the winding shaft, includes a winding motor and a drive transmission unit; a tension applying member that is disposed so as to be movable along a guide on the upstream side of the winding member in a conveyance direction of the medium, moves along the guide while being in contact with the medium to be conveyed, provides tension to the medium to be conveyed; a rotating member that is disposed between the winding member and the tension applying member in the conveyance direction of the medium, guides the medium in the conveyance direction of the medium; a position detecting unit that detects a position of the tension applying member; an output changing unit with an output that varies according to a rotation of the winding shaft; and 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 a result of output change by the rotation of the winding shaft, wherein the drive unit includes a torque limiter that idles when torque equal to or greater than a limit torque is applied.

Assignees

• Oki Data Kk

Inventors

• Wada Toshiyuki

Classifications

• B41J15/16

  Means for tensioning or winding the web · CPC title

• B65H23/063

  and controlling web tension · CPC title

• B65H18/26 Primary

  Mechanisms for controlling contact pressure on winding-web package, e.g. for regulating the quantity of air between web layers · CPC title

• B65H23/1955 Primary

  and controlling web tension · CPC title

• B65H2515/815

  Slip · CPC title