Document Type and Number:
Japanese Patent JPS4842471
Kind Code:
A
Abstract:
Apparatus for changing the operating or work stroke of a punch press with a double eccentric for the mounting of a drive crank, said double eccentric being arranged upon a drive shaft and consisting of an inner eccentric and an outer eccentric sleeve or bushing. A locking pin guided in a radial bore of the inner eccentric at one end cooperates by means of teeth with internal teeth of the eccentric sleeve and at the other end is spring-loaded. A central adjustment spindle cooperates with the locking pin, and due to rotation of the adjustment spindle the locking pin can be displaced against the spring-load out of engagement with the internal teeth of the eccentric sleeve. There is also provided an axially displaceable sleeve or bushing which surrounds the adjustment spindle and cooperates with a slotted plate spring which in its stressed condition connects the inner eccentric by fixedly clamping same with a drive element. The inner eccentric, when the locking pin is inactivated, is rotatable with regard to the fixedly retained eccentric sleeve and therefore the eccentricity of the double eccentric and the drive stroke of the punch press is adjustable.
Application Number:
JP9792372A
Publication Date:
June 20, 1973
Filing Date:
September 29, 1972
Export Citation:
International Classes:
B26D5/14; B30B1/26; B30B15/06; (IPC1-7): B30B1/26