Measuring the Punching Profile of a Punch And Bind Machine

In the design process of a manual or electrically actuated punch and bind machine, the required force to punch a stack of paper sheets is a crucial parameter that affects ergonomics, product design, power requirements, and ultimately product cost. The required punch force profile considered two punch pin geometries, introducing some innovative aspects. Measurements were performed using a tensile/compression machine and the punching force profile of the 21 punching pins arrangement during punching cycle was extracted for both geometries. Results show a smoother force profile for the double shear angle punching pin arrangement as opposed to the concave pin geometry pin arrangement with a lower peak punching force value.