Roll paper pulling load-buffering device for a printer

摘要

A roll paper pulling load-buffering device enables smooth roll paper transportation and minimizes the space required for its installation in the printer. The load-buffering device has an arm 22a that moves a specified angle around the shaft 24 on which the roll paper turns. A roller 23 extends widthwise to the roll paper from the arm 22a at a point offset from the outside diameter of the roll. Paper pulled off the roll is draped around this roller 23. When a transportation roller is driven to advance paper from the roll by pulling from the end of the roll, tension applied to the paper causes the arm 22a to turn in one direction by way of the intervening roller 23. An urging means 25 such as a spring then urges the roller 23 and arm 22a in the opposite direction, maintaining even tension on both sides of the roller 23 and thereby enabling smooth roll paper transportation.