Browse Prior Art Database

Selectable Compliance Pick-up Nozzle

IP.com Disclosure Number: IPCOM000112027D
Original Publication Date: 1994-Apr-01
Included in the Prior Art Database: 2005-Mar-26
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

Edmundson, RJ: AUTHOR [+3]

Abstract

Disclosed is a mechanism which provides spring-cushioned control of contact forces between a vacuum pick-up nozzle and DUTs during loading into a workstation Because the pick-up heads of the loading assembly are not servo-controlled, but are actuated by pneumatic cylinders with fixed up and down positions, a vacuum nozzle design was required that:

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 85% of the total text.

Selectable Compliance Pick-up Nozzle

      Disclosed is a mechanism which provides spring-cushioned
control of
 contact forces between a vacuum pick-up nozzle and DUTs during
loading into a workstation Because the pick-up heads of the loading
assembly are not servo-controlled, but are actuated by pneumatic
cylinders with fixed up and down positions, a vacuum nozzle design
was required that:

o   ensured positive contact with DUTs for a reliable vacuum seal,

o   protected DUTs from damaging contact forces, and

o   compensated for different sizes of DUTs, as well as for
    clearances in the carriers in which they are transported.

The Selectable Compliance Pick-Up Nozzle satisfied these
requirements.

      The nozzle assembly, shown in Fig. 1, consists of a stainless
steel nozzle body 1, threaded onto the Z head 2.  In the bottom end
of the body is a precisely machined counterbore to accommodate the
actuator 3.  The actuator is through-bored for vacuum feed through
tip 4, made of soft rubber for effective sealing, and is held in
place by a barb on the actuator.  The upper end of the actuator is
closely fitted with the body and counterbored to accommodate the
compliance spring 5.  The actuator and spring are held in place in
the body by a threaded retainer 6.

      The pick-up assembly is set up so that the bottommost position
of pick-up head travel is below the expected position of the DUT's
top surface.  When the nozzle tip contacts the DUT, the t...