I like the portion of Don's message that says an interlock is open when "a
condition that prevents or has stopped printing due to some mechanical
irregularity." This seems to encompass many conditions (Gail's, Don's and
Angelo's) without the requirement that the interlock is to "prevent injury
to a human."
Bob Pentecost
HP
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From: Don Wright[SMTP:don at lexmark.com]
Sent: Saturday, March 08, 1997 4:58 PM
To: Bob Pentecost
Cc: 'PWG-pmp'
Subject: RE: PMP> cover -v- interlock
Actually, I have never heard an interlock described
in the way Gail described it. In every case I am
aware of, an interlock (in this context) is used to:
1) stop the daisy wheel printer when the top cover
is opened.
2) prevent you from moving the gear shift from
park unless the brake is depressed.
3) etc.
When 1759 was developed, we discussed sensors
and switches in the context of an interlock so that
when the cartridge was missing from a laser printer,
an INTERLOCK would prevent the printer from being
used. In this case there is no cover open yet the
desire is to signal a condition that prevents or
has stopped printing due to some mechanical
irregularity.
Don
To: pmp%pwg.org @ interlock.lexmark.com ("'PWG-pmp'") @ SMTP
cc: (bcc: Don Wright)
From: bpenteco%boi.hp.com @ interlock.lexmark.com (Bob Pentecost) @ SMTP
Date: 03/07/97 04:49:47 PM
Subject: RE: PMP> cover -v- interlock
I prefer Gail's definition for interlock. Don's definition implies that
something dangerous to a person or the printer can happen and I don't think
that's always the case.
Bob Pentecost
HP
----------
From: Don Wright[SMTP:don at lexmark.com]
Sent: Friday, March 07, 1997 2:49 PM
To: Gail Songer
Cc: pmp%pwg.org
Subject: Re: PMP> cover -v- interlock
Gail songer said:
>A "door" is something that protects the mechanical insides of a device.
This one sounds good to me.
>An "interlock" connects two components of a device or two devices. An
example
>of an interlock is mechanical latch on an optional sorter that connects
the
>base printer with the sorter.
I would define an interlock as:
A switch or sensor used to stop operation of the device due to the
opening of a door, cover or other component of the device in order
to prevent injury to a human or improper operation of the device.
Don