Mold clamping mechanism of molding machine
AssigneeFanuc Corporation
InventorsSusumu Ito, Koichi Nishimura
Life of this patent
Estimating the term…
Abstract
A ball spline nut is provided in each of tie bar penetrating holes formed in a moving platen constituting a mold clamping mechanism of an injection molding machine. On the other hand, a portion of a tie bar one end of which is fixed to a stationary platen, engaging with the tie bar penetrating hole in the moving platen, is made a ball spline shaft. Since there is no clearance between the ball spline shaft and the ball spline nut engaging therewith, in mold clamping and mold releasing processes, the posture of a movable mold attached to the moving platen with respect to a stationary mold attached to the stationary platen is always kept constant.
Claims8
A mold clamping mechanism of a molding machine, comprising:
- a stationary platen with a stationary mold fixed on a base frame of said molding machine;
- a plurality of tie bars, each having a first end fixed to said stationary platen and a portion that includes a plurality of spline grooves;
- a moving platen formed with a plurality of tie bar penetrating holes, each of said plurality of tie bars passing through a respective one of the tie bar penetrating holes, such that said moving platen, which has a movable mold attached to one face, can be moved along said tie bars toward or away from said stationary platen, thereby performing mold clamping or mold releasing;
- and
- two or more ball spline nuts provided in each of the plurality of tie bar penetrating holes in said moving platen, said bail spline nut including a plurality of balls such that at least a portion of each ball spline nut engages said moving platen and the plurality of balls engages the spline grooves.
A molding machine, comprising:
- a stationary platen;
- a plurality of tie bars, each having a first end fixed to the stationary platen and a portion that includes a plurality of spline grooves;
- a moving platen with a plurality of tie bar penetrating holes, each of the plurality of tie bars passing through one of the plurality of the tie bar penetrating holes;
- and
- two or more ball spline nuts at each of the plurality of tie bar penetrating holes, said ball spline nut including a plurality of balls wherein at least a portion of the at least one ball spline nut is engaged with the moving platen and the plurality of balls engages the spline grooves.
Dependencies are inferred from the claim text.