The Model 23B
Sequential Event Memory is a single channel shift-register alarm delay device useful for marking or sorting defects in moving material some time after their detection. The memory may be "clocked" from a pulse generator tied to the conveyor drive. This makes
marking accuracy independent of changes in drive speed. Bulletin 203 describes some uses.
The Model 20A Air-actuated Felt-tip Pen
Marker affords a simple and
economical way to mark defect locations on moving
material. A conventional felt-tip marker pen is modified
to enable it to be driven by a small air cylinder onto
the part to be marked. It is then retracted into a
housing to prevent drying out of the tip. See Newsletter
12 for more data.