公开(公告)号：US5859656A

公开(公告)日：1999-01-12

申请号：US727116

申请日：1996-10-08

申请人： Cathy L. Aragon ,  Todd W. Leiby ,  Duane M. Fox

发明人： Cathy L. Aragon ,  Todd W. Leiby ,  Duane M. Fox

IPC分类号： B65H23/08 ,  B65H59/38

CPC分类号： B65H23/08 ,  B65H2402/541

摘要： An apparatus for providing back tension onto a print media web comprises a plate having a post extended perpendicularly therefrom. The post is adapted to support a roll of print media thereon such that a web of the print media roll is paid out by rotation of the roll about the post. A constant-force spring is attached to a portion of the media plate at and has a handle coupled to an opposite end of the spring. A pressing element is coupled to the handle such that the spring is biased to urge the pressing element against the media supply roll to maintain the roll firmly in contact with the post during rotation of the roll. The force provided by the pressing element onto the media supply roll imparts sufficient back tension on the print media web to maintain a constant pay out rate. The present back tension apparatus provides a relatively simple mechanism that is readily adaptable for many conventional printers, such as a thermal transfer printer.

摘要翻译： 用于在打印介质网上提供背张力的设备包括具有从其垂直延伸的柱的板。 该柱适于在其上支撑一卷打印介质，使得通过围绕柱的旋转来支付打印介质卷的卷筒纸。 恒力弹簧附着在介质板的一部分上，并且具有与弹簧的相对端连接的手柄。 按压元件联接到手柄，使得弹簧被偏压以将压力元件推靠在介质供给辊上，以在辊的旋转期间使辊牢固地保持与柱接触。 由压力元件提供到介质供应辊上的力在印刷介质卷筒上施加足够的背张力以保持恒定的付出率。 本发明的后张力装置提供了一种相对简单的机构，其易于适用于诸如热转印打印机的许多常规打印机。