Patent ID: 6119911
Filing Date: 2000-09-19
Classification: B27F,B42B

Abstract:
Stapling device for stapling a stack of sheets by staples that are cut off from a staple wire supply and shaped in the stapling head region, said stapling device comprising:a staple wire transport device which transports staple wire a corresponding length as a function of the thickness of a sheet stack to be stapled;a movable staple wire cutting element which positions staple wire, as a function of the thickness of the sheet stack to be stapled, centrally with respect to a staple shaping element on the stapling head;said staple wire transport device driven by a stepping motor whose drive direction is reversible and which is activated by a measuring device which determines the thickness of the stack to be stapled;said stepping motor coupled to said staple wire transport device by a coupling that is effective only in a staple wire transport direction;said stepping motor continuously coupled to a movable cam unit which controls a displacement of said staple wire cutting element; andsaid cam unit includes control segments which are associated with different sheet stack thicknesses, said cam unit being rotatably mounted on a shaft and having two gears, mounted rotatably about said shaft and joined to one another via an overrunning clutch, one gear of said two gears being rigidly joined to said cam unit, and in engagement with a non-axially displaceable gear of said stepping motor, the other gear of said two gears being rigidly joined to a staple wire transport wheel and in engagement with a gear which is mounted displaceably axially with respect to said non-axially displaceable gear, and said axially displaceable gear being selectively brought into positive engagement with said non-axially displaceable gear.