Abstract: An automatic self-inking, rubber-stamp device comprising a housing, ink pad, stamp plate and spring-loaded actuator. The device incorporates a guide pin integrally formed on the stamp plate and a cam formed on the housing wall which when the actuator is pressed down all act in coordination to turn the stamp plate over, from its resting position against the ink pad, to be pressed against the subject document. The device is further characterized by use of fewer components than in other products of the art, by its simplicity of construction and by its snap-together assembly thereby making it particularly suitable for automated and robotic assembly processes.

Abstract: To prevent escape of ink from a gap (A) between the edge surface (11) of a side wall portion (10) facing a printing machine roller (9) and the surface of the roller, the side wall (3), or at least the side wall portion, is upwardly, outwardly inclined, so that internal flow of printing ink within the chamber, upon rotation of the roller, will result in a resultant flow speed vector (V.sub.res) which is inclined at an angle (.beta.) which is less than the angle of inclination (.alpha.) of the side wall, and thereby push liquid away from the side wall and hence from said gap (A).