Browse Prior Art Database

Retractable Auto-Alignment Scheme and Hardware for Non-Symmetrical Parts

IP.com Disclosure Number: IPCOM000111927D
Original Publication Date: 1994-Apr-01
Included in the Prior Art Database: 2005-Mar-26
Document File: 4 page(s) / 120K

Publishing Venue

IBM

Related People

Kelly, HL: AUTHOR

Abstract

Disclosed is a methodology and its associated hardware to allow alignment of thin sheet lids or equivalent parts to frames to which they are to be attached in some processing step, where the alignment hardware must be applied and then removed out of the way, and where the mating parts are rectangular but not square, thereby precluding the use of standard opposing linear-action parallel-motion gripper/locator devices. The main applications are for situations where a standard fixed (i.e., no moving parts) nesting locator cannot be utilized, and the parts to be aligned vary in size and shape, but are always rectangular, and there is a desire to have an adaptable locating setup that will adjust quickly to any of the various sizes of the parts.

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Retractable Auto-Alignment Scheme and Hardware for Non-Symmetrical
Parts

      Disclosed is a methodology and its associated hardware to allow
alignment of thin sheet lids or equivalent parts to frames to which
they are to be attached in some processing step, where the alignment
hardware must be applied and then removed out of the way, and where
the mating parts are rectangular but not square, thereby precluding
the use of standard opposing linear-action parallel-motion
gripper/locator devices.  The main applications are for situations
where a standard fixed (i.e., no moving parts) nesting locator cannot
be utilized, and the parts to be aligned vary in size and shape, but
are always rectangular, and there is a desire to have an adaptable
locating setup that will adjust quickly to any of the various sizes
of the parts.

      The specific application shown in the figure involves the
aligning of a thin sheet of Kovar to a High Density Hermetic Card
(HDHC) frame located below, for seam welding along its outer edges by
a set of rolling electrode arms.  (These arms are part of a larger
overall package sealing tool, not shown.)  In this application, it is
required that the lid be aligned to the frame and held there in place
by contact somewhere out of the way of the rollers, while the rollers
pass along the four sides of the assembly.  All locating tooling that
interfaces along the sides and corners must be retracted up out of
the way when the rollers are actuated.

      The solution is depicted in Figs 1 and 2.  By using two sets of
opposing parallel-motion slide assemblies 1 mounted across from each
other on a horizontal platform 2 that is able to be raised and
lowered in a guided fashion over the work area by use of adjustable
flow two-way hydraulically damped pneumatic cylinders 3 and guide
shafts 4, a structure is provided for moving the alignment system
down for contact and up out of the way during processing by the
roller arm electrodes 5.  (Note:  The design of a parallel-motion
slide assembly uses either rack and pinion or other means to ensure
that its two carriages move towards and away from their common
centerpoint at the same rate, displacement, speed, etc.)  Mounted
perpendicularly to the slide assemblies 1 on their carriages 6 are
opposing shafts 7 that have a single carriage 8 each and a fixed,
centered, mounting collar 9 each.  Mounted to each of these carriages
8 is a simple "V" type jaw 10 that hangs below for locating the lid
11 against the frame 12 in opposing corners.  In addition, a
swivelling linear bearing 13 is mounted above each carriage 8.  The
diagonal link shaft 14 shown passing through each of the bearings 13
and pivoted in its center (over the ce...