Question for PAYA BORESH MACHINE MFG. CO.

I have machine which type is guillotine model pb.g there is problem happen (the luck which conduct to knife do not hold it after cutting stroke .when we chick the juck I find it in good condition.how I can I solve this problem .please answer me and sent to me operation manual catloge and maintaince catloge.
with my respect .
Engineer Raooaf al mamorey.