Abstract: A constant pressure printing mechanism for use in a label printing machine: the platen is pivotally secured to the machine body; the pivotally supported, hand operated printing levers include a projection, which engages a pivotally supported platen lifting member, and the lifting member is pivoted by the projection to turn the platen toward the printing head, whereby the printing head and the platen are moved near to each other to perform the printing of labels.

Abstract: A constant pressure printing mechanism for use with a hand labeler: an actuating lever, pivotally connected to the frame of the hand labeler, is divided into a hand lever and a printing lever, which are pivotally connected to each other; a printing head is carried by the printing lever; a shock-absorbing tensioned spring is interposed between the hand lever and the printing lever to bias them to rotate toward each other and to rotate the printing head toward the platen; a retaining lever, pivotally attached on the hand lever, is engageable with the printing platen upon descent of the printing lever; before such engagement, the retaining lever retains the hand lever on the printing lever to move together; when the printing head moves to the platen, the retaining lever is raised away from the printing lever by its engagement with the printing platen; this enables the hand lever to further pivot slightly against the biasing force of the tension spring, even when the printing head abuts against the platen, so tha

Abstract: A constant pressure printing mechanism for a portable label printing machine, or the like, comprising a driving member which is disposed on either the movable hand lever or the stationary hand grip of the label printing machine and a pressure receiving member which is disposed on the other of the hand lever or the hand grip. The invention uses stored energy derived from a manual squeezing operation to produce the printing stroke, independently of the intensity and duration of a manual squeeze. In one form, the driving member comprises a movable roller, a guiding means to allow the movable roller to move therethrough and an elastic means which always urges the movable roller in one direction and the pressure receiving member comprises a contact surface and an arcuate surface to be brought into contact with the above movable member when the hand lever is squeezed.

Abstract: A printing pressure damping mechanism for a hand labeler: A printing platen is pivotally mounted on the frame of the hand labeler. The platen has a printing portion at one side of its center of pivotal motion. A hand lever pivotally connected to the frame of the labeler carries a printing head, which is turned toward the printing platen when the hand lever is squeezed against the biasing force of a return spring. Shock-absorbing means, comprising a leaf spring on the hand lever and an elastic abutment member on the other side of the printing platen from the printing portion engage to turn the printing portion of the printing platen toward the printing head. The hand lever is further squeezed and moves to overcome the biasing force of the leaf spring when the printing head abuts against the printing portion of the platen. The squeezing force, which might otherwise be applied as a printing force to the printing platen through the hand lever, is damped to a preset level.