sane-project-website/old-archive/1999-07/0182.html

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<title>sane-devel: Document Feeders (was Re: Anyone with a Umax Document Feeder?)</title>
<h1>Document Feeders (was Re: Anyone with a Umax Document Feeder?)</h1>
<b>Nick Lamb</b> (<a href="mailto:njl98r@ecs.soton.ac.uk"><i>njl98r@ecs.soton.ac.uk</i></a>)<br>
<i>Mon, 26 Jul 1999 23:16:02 +0100 (GMT)</i>
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On Mon, 26 Jul 1999, Oliver Rauch wrote:<br>
<p>
<i>&gt; OK EVERYBODY:</i><br>
<i>&gt; :s.,$s/mode/source/g ;-)</i><br>
<p>
With this cleared up, and the explanation of ADF behaviour in Oliver's<br>
hardware, I now understand what he's up to.<br>
<p>
However, now I'm really not sure how the HP fits in to this. Oliver's<br>
description (presumably correct for *at least* Umax ADF) ...<br>
<p>
Paper feed is continuous, scan head remains still while paper is moved<br>
past it. I'm not clear on how you tell where pages end etc. but that<br>
logic is presumably all to be concealed in the backend.<br>
<p>
The HP, which I have right here, and have used without specific support<br>
in the past, provides ADF functionality like this...<br>
<p>
Paper feed loads/ unloads one sheet at a time, quickly and SIDEWAYS<br>
compared to the A4 flatbed design. The scanning itself proceeds as<br>
usual, and to scan multiple sheets you must do a *complete* scan for<br>
each sheet then send the "load next sheet" SCL command and repeat.<br>
<p>
Can we reconcile these two approaches into a single mechanism? Do a<br>
lot of scanners work the way Oliver describes (I've never seen one,<br>
but I've only seen a few dozen scanners with ADF and they were probably<br>
all made by HP)<br>
<p>
Also, Oliver: Does the Umax way give you separate scan data for each<br>
sheet, or does the user/app have to cut it up post-scan?<br>
<p>
Nick.<br>
<p>
<p>
<pre>
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<li> <b>Next message:</b> <a href="0183.html">Keith Gross: "OCR package?"</a>
<li> <b>Previous message:</b> <a href="0181.html">regis rampnoux: "RE: supported scanner that can scan from microfilm?"</a>
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<li> <b>Next in thread:</b> <a href="0189.html">Oliver Rauch: "Re: Document Feeders (was Re: Anyone with a Umax Document Feeder?)"</a>
<li> <b>Reply:</b> <a href="0189.html">Oliver Rauch: "Re: Document Feeders (was Re: Anyone with a Umax Document Feeder?)"</a>
<li> <b>Reply:</b> <a href="0194.html">Oliver Rauch: "Re: Document Feeders (was Re: Anyone with a Umax Document Feeder?)"</a>
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