Clamping apparatus for molding machine

A clamping apparatus, comprising:

• a movable board and a fixed board, said movable board being movable relative to said fixed board;
• a plurality of mold clamping cylinders disposed on one of the fixed board and the movable board;
• a plurality of tie bars disposed on the other of said movable board and said fixed board, each tie bar having a threaded shaft at one end thereof and being in alignment with an associated mold clamping cylinder;
• a mold opening/closing cylinder;
• a clamping piston disposed in each clamping cylinder, each piston having a tie bar reception hole;
• means, disposed on each clamping piston, for clamping said threaded shaft when the associated tie bar is received in the reception hole;
• and
• a mold thickness adjustment device associated with each clamping cylinder and including a threaded pipe, a stopper movably screwed in said pipe and adapted to contact an end of an associated tie bar and moving means for axially moving said stopper, wherein said stopper is positioned to contact an end of said associated tie bar prior to a mold closing position so that during a mold closing operation said associated tie bar abuts against said stopper and axially moves said piston to said mold closing position thereby decelerating said associated tie bar, the apparatus further comprising means, associated with each clamping cylinder, for adjusting an axial position of an associated clamping means and piston to adjust an engagement position of said associated clamping means, wherein said adjusting means includes a sleeve disposed in an opening formed in said one board, the sleeve forming an extension of the tie bar reception hole of the associated piston, one end of the sleeve abutting against a reception wall provided in each piston surrounding the tie bar reception hole, the other end of the sleeve threadedly cooperating with an engagement adjustment screw ring secured to said one board, whereby the sleeve is axially movable to adjust the position of the associated piston.

A clamping apparatus, comprising:

• a movable board and a fixed board, said movable board being movable relative to said fixed board;
• a plurality of mold clamping cylinders disposed on one of the fixed board and the movable board;
• a plurality of tie bars disposed on the other of said movable board and said fixed board, each tie bar having a threaded shaft at one end thereof and being in alignment with an associated mold clamping cylinder;
• a mold opening/closing cylinder;
• a clamping piston disposed in each clamping cylinder, each piston having a tie bar reception hole;
• a pair of tie bar connection devices disposed on each clamping piston, each connection device including a chuck engageable with the threaded shaft when the associated tie bar is received in the reception hole;
• and
• means, associated with each clamping cylinder, for adjusting an axial position of an associated chuck and piston to adjust an engagement position of said associated chuck with respect to an associated tie bar, wherein said adjusting means includes a sleeve disposed in an opening formed in said one board, the sleeve forming an extension of the tie bar reception hole of the associated piston, one end of the sleeve abutting against a reception wall provided in each piston surrounding the tie bar reception hole, the other end of the sleeve threadedly cooperating with an engagement adjustment screw ring secured to said one board, whereby the sleeve is axially movable to adjust the position of the associated piston.