Patent ID: 7815431

Claim:
A drive system ( 10 ) for shutoff needles in an injection mold fitted with needle shutoff nozzles, comprising an elevation drive element ( 20 ) to which is affixed at least two shutoff needles ( 16 ) of two needle shutoff nozzles and which are displaceable between two control rails ( 30 ) supported in longitudinally displaceable manner in a first direction (R 1 ) in a second direction (R 2 ) transverse to the first direction (R 1 ), with at least two glide elements ( 50 ), said of two glide elements converting a displacement of the control rails ( 30 ) along the first direction (R 1 ) into a vertical excursion of the elevation drive element ( 20 ) in the second direction (R 2 ), characterized in that the drive element ( 20 ) is situated longitudinally between the control rails ( 30 ); in that the glide elements ( 50 ) are configured between the elevation drive element ( 20 ) and the control rails ( 30 ), in grooves ( 40 ) oblique to the first direction (R 1 ) and to the second direction (R 2 ); and wherein at least the control rails ( 30 ) and/or the glide elements ( 50 ) as components moving relative to one another and thereby exposed to wear are made at least in part of a self-lubricating or a diamantine material or are coated at least in part with a self-lubricating or a diamantine material.