Microfiche-Positioning Mechanism

Microfiche-Positioning Mechanism

 

      Positioning a microfiche on a viewer can be difficult because the pressure of the lens holder can cause the microfiche to buckle and rotate on the screen.  The sliding motion of the fiche through a pressure gate exhibits “stiction”, at first sticking and then overshooting that adds to the user’s frustration.  

Fiche-Positioning-Mechanism-01-anim

      Shown conceptually, a pair of lateral rubber rollers (for front-back motion) rest on top of the viewer.  Another pair of longitudinal rollers (for left-right motion) rest on the first pair of rollers.  The fiche, resting on the top rollers, is free to translate in any direction.

 

Fiche-mech-test-gray

 


 

Fiche-Positioning-Mechanism-02

      The entire mechanism is very compact and self contained because the rollers move only half as far as the microfiche, always staying within the dimensions of the microfiche.  

      The grooved guides keep the assembly together in a general sense, however the frame hovers around the rollers which are providing the frictionless movement.  

 

      The microfiche is held under a hinged clear cover on a frame that hovers loosely around the rollers.  Due to the almost-zero rolling friction, the fiche holder can be moved almost with the feeling of pushing a cork floating on water.  Due to the friction of the upper rollers on the lower rollers, at four contact points, non-rotation of the fiche is essentially guaranteed.  


 

Fiche-Positioning-Mechanism-03

The lamphouse hovers slightly above the moving fiche frame so that there is no friction drag.


 

     

      Developed in 1979 by Steve Hines, and the subject of U.S. patent 4,374,611 which is assigned to Eastman Kodak.  This is not a product for sale, but is shown as an example of engineering by Steve Hines, which clients can expect on a consulting basis.  
Please contact Steve Hines at:
HinesLab, Inc.
Glendale, California, USA
email:  Steve@HinesLab.com
phone:  818-507-5812