Method for assembling micro-filter units

A process for assembling microfilter units having a barrel, a plug adapted for insertion into said barrel, and a filter disc clamped between the barrel and the plug, which comprises the steps of positioning the barrel in a barrel holder with its open end apposed to a punch and die with the axis of the barrel coinciding with the axis of the punch, said punch being adapted to punch out a filter disc and to seat it in said barrel, punching out said filter disc and seating it in said barrel in a single stroke of said punch, and inserting the plug into engagement with the filter disc in which the barrel is moved partly out of said barrel holder and into engagement with the die by pneumatic pressure means, and in which the punch, after seating the filter disc, pushes the barrel out of engagement with the die into the barrel holder by overcoming the pneumatic pressure means.

A process for assembling a device comprising a barrel and a cut disc adapted to be seated in the bottom of said barrel which comprises seating said barrel in a barrel holder, moving said barrel partly out of the holder into contact with the die member of a punch and die assembly with the axis of the barrel coinciding with the axis of the punch, punching out said disk and seating it in said barrel in a single stroke of said punch and continuing the punch stroke to move said barrel back into said barrel holder.