Two-apron drafting unit for spinning machines

A multiple-apron drafting unit for spinning machines comprising:

• at least one drivable bottom cylinder,
• a bottom apron arrangement surrounding the at least one bottom cylinder,
• a pressure roller twin arrangement including a pressure roller shaft with a pair of pressure rollers,
• top aprons surrounding each of the pressure rollers,
• a movable load carrier operably arranged to carry the pressure roller shaft and associated pressure rollers and top aprons for movement between an open non-operating position and a closed operating position with the top aprons and bottom apron arrangement defining sliver drafting paths therebetween,
• a top apron cradle for guiding the top aprons, said top apron cradle including upper deflecting guides for the top aprons,
• a lower deflecting guide arrangement for guiding the bottom apron arrangement,
• stops with first and second stop faces aligned with the lower deflecting guide arrangement,
• and a spring arrangement for positioning the upper deflecting guides of the top apron cradle by contact pressure against the first and second stop faces such that the first stop face determines the distance between the upper and lower deflecting guides and the second stop face serves for the parallel alignment of the upper and lower deflecting guides when the load carrier is moved to the closed operating position,
• wherein the pressure roller shaft is held in a pressure roller holder carried by the load carrier with the pressure roller shaft being unguided in the radial direction in the pressure roller holder such that a pressure roller holder moves independently of the top apron cradle in the movements against the first and second stop faces.