Browse Prior Art Database

Air Spring for Magnet Repulsion Punch Return

IP.com Disclosure Number: IPCOM000106948D
Original Publication Date: 1992-Jan-01
Included in the Prior Art Database: 2005-Mar-21
Document File: 3 page(s) / 90K

Publishing Venue

IBM

Related People

Bruhn, PH: AUTHOR

Abstract

Disclosed is a concept for returning punches to home position, using compressed air which is infinitely adjustable, rather than dedicated wire wound spring.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 55% of the total text.

Air Spring for Magnet Repulsion Punch Return

       Disclosed is a concept for returning punches to home
position, using compressed air which is infinitely adjustable, rather
than dedicated wire wound spring.

      The air spring was specifically designed for use in a Magnetic
Repulsion Punch System.  In tool, a spring is required to return the
punch to the magnetic repulsion coil face and keep it in intimate
contact with the coil between punching operations.  The magnetic
field generated by the coil will cause an opposing field to be
generated in the copper disk, which, in turn, causes the punch to be
repelled by the coil, and permits magnetic repulsion punching.  The
gap between the coil and the copper disk must be minimized, since the
greater the gap the smaller the repulsion force.  Because the spring
force is in direct opposition to the repulsion force, it becomes a
critical component in the system.  Too much force and it will
decrease the punch velocity; too little force and it does not permit
the copper disk to latch with the coil.  Prior to the air spring, a
number of wire wound springs of varying loads had to be designed and
inserted into the system in order to optimize the performance of the
punch.  Even with the assortment of springs, the system could not be
completely optimized due to the step function of going from one
spring to another.  With the air spring there is an infinite
adjustment and no compromise.

      Figs. 1 through 5 show t...