Abstract: A printer is fitted with a squeeze printing mechanism employing a toggle or over-the-center crank mechanism to provide direct pressure to a printing element for accurate impression depth control during imprinting and for achieving low velocity at the time of print element contact with the paper to materially reduce printing noise. Mechanism and linkages are provided for either single or double electromagnetic actuators. The linkages are arranged to provide rectilinear movement of the type face bearing element just prior to and during imprinting. Over pressure relief is provided for the toggle or over-the-center crank mechanism to prevent damage or lock-up if the printer platen position is not correctly adjusted for the paper being used.

Abstract: In a hand-operated label printing machine, including a hand lever and a printing head attached to the hand lever; a printing pressure buffer mechanism or a constant pressure printing mechanism which comprises: in a first embodiment, a spring-actuated engaging member formed in the hand lever and a cooperating checking shoulder which is formed in the main body of the machine; an inclined groove leads to the shoulder; the shoulder is brought into disengageable engagement with the spring-actuated engaging member for moderating the printing pressure; and when the spring-actuated engaging member rides over the checking shoulder, the printing head is actuated; in a second embodiment, a pressure receiving engaging member is carried on the hand lever, through a lost motion connection; a pressure contact member and a guide member are both carried on the main body of the machine and are spaced apart; the pressure receiving engaging member is integrally provided with a pressure receiving piece having a cam surface at the