Rotary drive apparatus for rotary body

Abstract

A rotary drive apparatus for a rotary body for rotating a rotary body through extension and extraction of the piston rod of the cylinder accurately determines a rotation start and a rotation termination position, and performs intrusive forming with the rotary cam being accurately positioned. As such, high-quality work processing can be implemented; and furthermore, shocks of a cylinder are absorbed, and are not transferred to the rotary body. A rotary drive apparatus for a rotary body for rotating a rotary body through extension and extraction of the piston rod of the cylinder is configured such that supporting axes are provided to respectively protrude from two ends of the rotary body, the supporting axes are held and the rotary body are rotatably provided, a central portion of a cam follower arm is fixed to the supporting axis, one end of the cam follower arm and the piston rod of the cylinder are connected via a guide plate provided therebetween, a guide groove is carved on the guide plate to rotate the cam follower separately in a stroke direction of the piston rod and in a direction perpendicular thereto, and a cam follower at the end of the cam follower arm is engaged with the guide groove.

What is claimed is:  
     
         1 . A rotary drive apparatus for a rotary body for rotating the rotary body through extension and extraction of a piston rod of a cylinder, wherein supporting axes are provided to respectively protrude from two ends of the rotary body, the supporting axes are held and the rotary body are rotatably provided, a central portion of a cam follower arm is fixed to the supporting axis, one end of the cam follower arm and the piston rod of the cylinder are connected via a guide plate provided therebetween, a guide groove is carved on the guide plate to rotate the cam follower separately in a stroke direction of the piston rod and in a direction perpendicular thereto, and a cam follower at the end of the cam follower arm is engaged with the guide groove.  
     
     
         2 . A rotary-cam driven apparatus for a negative-angle forming die comprising a lower die for mounting a work of a thin metallic sheet onto a supporting portion, an upper die that is linearly descended to said lower die for forming the work by joining up against the work, a rotary cam rotatably provided in the lower die to include an intrusive-forming portion that is formed at an edge portion closer to a supporting portion and that is intruded from a locus of the upper die, a slide cam that includes an intrusive-forming portion and that is provided to be slidable in opposition to said rotary cam, and an automatic returning tool provided to the lower die for rotationally retracting the rotary cam to be in a state where the work can be taken out from the lower die after the forming process, wherein the slide cam performs the forming of the work set on the supporting portion of the lower die by using the intrusive forming portion of the rotary cam and the intrusive slide cam, and the rotary cam is rotationally retracted by the automatic returning tool to enable the formed work to be taken out from the lower die after the forming process; wherein supporting axes are provided to respectively protrude from two ends of the rotary body, the supporting axes are held by the lower die and the rotary body are rotatably provided, a central portion of a cam follower arm is fixed to the supporting axis, one end of the cam follower arm and the piston rod of the cylinder are connected via a guide plate provided therebetween, a guide groove is carved on the guide plate to rotate the cam follower separately in a stroke direction of the piston rod and in a direction perpendicular thereto, and a cam follower at the end of the cam follower arm is engaged with the guide groove.