| 摘要 |
A constant printing pressure mechanism for a label printing machine: in one embodiment, a pressure applying roller is attached to the free ends of the yokes or printing levers that support the printing head; a resilient pressure receiving member which is pivotally supported on the machine frame and is abutted by the pressure roller; when the hand lever is squeezed, the pressure roller is pressed to the pressure receiving member; when the force of the pressure roller both pivots the receiving member a permitted maximum distance and overcomes the compressive stress in the resilient pressure receiving member and deflects the member, then the printing stroke is effected; in another embodiment, the pressure applying roller is on the frame and the resilient pressure receiving means is on the hand lever; the pressure receiving means comprises: a supporting member attached to a hand lever; a pressure controlling member which is pivotally secured to the hand lever; a pressure receiving piece having a cam surface on the front side thereof and being pivotally secured to the pressure controlling member; and a spring member which is interposed between the supporting member and the pressure controlling member.
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