Patent ID: 8529229
Filing Date: 2013-09-10
Classification: B41J

Abstract:
1. An ink jet printing apparatus that uses a printing head and ejects ink onto a printing medium from the printing head to perform printing, said apparatus comprising: a tube pump for causing a pressure change of ink in an ink ejection opening of the printing head to suck ink, said tube pump including: an introduction portion through which a pair of the tubes is introduced from an outside of the tube guide and at which one of the rollers comes into contact with the pair of the tubes, which are arranged along the same imaginary plane, simultaneously when the roller holder rotates in the forward direction; and a guide member supporting the pair of the tubes, which are arranged on the same imaginary plane, therebetween at a neighborhood of the introduction portion, the guide member being arranged to extend from a neighborhood of an extended portion of the inner circumferential surface, along a radial direction with respect to a center of a circle formed with the inner circumferential surface.