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PICList Thread
'[OT]: OEM Printer Suggestion'
2001\06\07@165644 by Shawn Yates

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Hello all,

       I want to build a small printer into a product.  It will record
events as they happen in the following format:


       06-07-01  05:51 pm    209    +
       06-07-01  05:56 pm    209    +
       06-07-01  05:59 pm    209    --

       Honestly I am flexable about what gets printed out, but I will be
printing only using a PIC (no PC involved at all), so I dont want to make it
too complicated for myself.

       Any suggestions or experiences to relate regarding what OEM type
printer mech to use?  I have absolutely NO experience makeing a printer work
from a PIC, so if anyone has the slightest story to tell, I will listen.

Regards,

Shawn

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2001\06\07@183938 by Dave Dilatush

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Shawn Yates <spam_OUTsyatesTakeThisOuTspamCARETECHNOLOGIES.COM> wrote...

>        I want to build a small printer into a product.  It will record
>events as they happen in the following format:
>
>        06-07-01  05:51 pm    209    +
>        06-07-01  05:56 pm    209    +
>        06-07-01  05:59 pm    209    --
>
>        Honestly I am flexable about what gets printed out, but I will be
>printing only using a PIC (no PC involved at all), so I dont want to make it
>too complicated for myself.
>
>        Any suggestions or experiences to relate regarding what OEM type
>printer mech to use?  I have absolutely NO experience makeing a printer work
>from a PIC, so if anyone has the slightest story to tell, I will listen.

I've used a PIC16C774 with the serial-interface version of a Citizen
model iDP3110 ticket printer.  All that was needed was a MAX242
interface chip, a DB9 connector, and a cable.  Very straightforward,
no problems.

Check out http://www.metsales.com/page8.cfm or do a search on
"iDP3110".

Dave

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2001\06\08@083724 by Shawn Yates

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Thanks.

I looked at that printer and its a little more 'complete' than I was hoping
for.  I am realy thinking about building the printer into my box so I would
need just the printer mechanism and some sort of interface.  I will check
out the 16C774 though and see what it is all about.  I am currenlty using a
16C67, but would change if it helped with development time.

Shawn

{Original Message removed}

2001\06\08@090809 by Ashley Roll

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Hi Shawn,

I looked something like this a little while ago, but didn't end up
proceeding..

I was looking at some of the Epson thermal mechanisms.. they seemed
relatively easy to use, you shift in the current "line" of data and strobe
the heater elements. The trick is that you have to do this as the paper is
moving so timing is important.

You would also need to be able to "render" text, so some internal
representation of a font is needed so you can build the line to print.

try: http://mechs.epson.com/

Good luck.
Ash.

> Shawn Yates <.....syatesKILLspamspam@spam@CARETECHNOLOGIES.COM> wrote...
>
> >        I want to build a small printer into a product.  It
> will record events as they happen in the following format:

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2001\06\08@092655 by Shawn Yates

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Not bad.  So if I limit the printing to chars 0 to 9 and a few markings (: -
+) then a lookup table could be used for the various lines of the chars.
That does not sound to hard.

Thanks.

{Original Message removed}

2001\06\08@105801 by David VanHorn

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At 11:05 PM 6/8/01 +1000, Ashley Roll wrote:
>Hi Shawn,
>
>I looked something like this a little while ago, but didn't end up
>proceeding..
>
>I was looking at some of the Epson thermal mechanisms.. they seemed
>relatively easy to use, you shift in the current "line" of data and strobe
>the heater elements. The trick is that you have to do this as the paper is
>moving so timing is important.

BTDT.

The pulse timing is tricky, unless you're willing to settle for dog-slow
performance.
It varies with head temperature, and print speed, and what got printed
recently.

Power supply design is interesting too.
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I would have a link to http://www.findu.com/cgi-bin/find.cgi?KC6ETE-9 here
in my signature line, but due to the inability of sysadmins at TELOCITY to
differentiate a signature line from the text of an email, I am forbidden to
have it.

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2001\06\08@113527 by Shawn Yates

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Oh, that makes it sound much more interesting!!

-----Original Message-----
From: David VanHorn [dvanhornspamKILLspamCEDAR.NET]
Sent: Friday, June 08, 2001 10:56 AM
To: .....PICLISTKILLspamspam.....MITVMA.MIT.EDU
Subject: Re: [OT]: OEM Printer Suggestion


At 11:05 PM 6/8/01 +1000, Ashley Roll wrote:
>Hi Shawn,
>
>I looked something like this a little while ago, but didn't end up
>proceeding..
>
>I was looking at some of the Epson thermal mechanisms.. they seemed
>relatively easy to use, you shift in the current "line" of data and strobe
>the heater elements. The trick is that you have to do this as the paper is
>moving so timing is important.

BTDT.

The pulse timing is tricky, unless you're willing to settle for dog-slow
performance.
It varies with head temperature, and print speed, and what got printed
recently.

Power supply design is interesting too.
--
Dave's Engineering Page: http://www.dvanhorn.org

I would have a link to http://www.findu.com/cgi-bin/find.cgi?KC6ETE-9 here
in my signature line, but due to the inability of sysadmins at TELOCITY to
differentiate a signature line from the text of an email, I am forbidden to
have it.

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2001\06\08@120011 by David VanHorn

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At 11:33 AM 6/8/01 -0400, Shawn Yates wrote:
>Oh, that makes it sound much more interesting!!

The one I went through, needed a power supply that could deliver pulses of
19A @ 32V to print a full black line. The pulse was something like 300uS
wide.  Definitely takes some good PCB routing too.

--
Dave's Engineering Page: http://www.dvanhorn.org

I would have a link to http://www.findu.com/cgi-bin/find.cgi?KC6ETE-9 here
in my signature line, but due to the inability of sysadmins at TELOCITY to
differentiate a signature line from the text of an email, I am forbidden to
have it.

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2001\06\08@122720 by Shawn Yates

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Yikes.  Maybee an impact printer would be a bit easier to impliment.  I am
expecting the thing to print something like 50 lines a day, so speed is not
of high importance at all.

{Original Message removed}

2001\06\08@123551 by Harold M Hallikainen

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       This reminds me of something to consider during initialization. Since
I/O ports are in input mode on reset, lines that are driving your
printhead drivers are floating. You COULD get all printhead drivers on
simultaneously during the time prior to setting the TRIS registers.
Appropriate pull-up or pull-down resistors in front of the drivers can
solve this.
       I once had an impact dot matrix printer that would fairly often blow
fuses on power up. All the print wire solenoids were hit simultaneously
until the processor finished initialization.

Harold


On Fri, 8 Jun 2001 10:58:39 -0500 David VanHorn <EraseMEdvanhornspam_OUTspamTakeThisOuTCEDAR.NET>
writes:
{Quote hidden}

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2001\06\08@125217 by Mark Skeels

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In the 70's I worked on such a design, and used an 8048 emulator to debug
the device. We originally used Intel 8255's, but got some National's in and
when I brought the power up on the device before starting the MCU, all the
outputs in the Nat. part latched on and the print solenoids, which were
designed only for _momentary_ energization, were driven continuously. Before
I could remove power, the print solenoids fried. The Intel part did not do
this. I had to replace the solenoids from another damaged printer to get the
thing running. (deadlines....)

Mark
{Original Message removed}

2001\06\08@132834 by Shawn Yates

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Duly noted.  Thanks

-----Original Message-----
From: Harold M Hallikainen [haroldhallikainenspamspam_OUTJUNO.COM]
Sent: Friday, June 08, 2001 12:32 PM
To: @spam@PICLISTKILLspamspamMITVMA.MIT.EDU
Subject: Re: [OT]: OEM Printer Suggestion


       This reminds me of something to consider during initialization.
Since
I/O ports are in input mode on reset, lines that are driving your
printhead drivers are floating. You COULD get all printhead drivers on
simultaneously during the time prior to setting the TRIS registers.
Appropriate pull-up or pull-down resistors in front of the drivers can
solve this.
       I once had an impact dot matrix printer that would fairly often blow
fuses on power up. All the print wire solenoids were hit simultaneously
until the processor finished initialization.

Harold


On Fri, 8 Jun 2001 10:58:39 -0500 David VanHorn <KILLspamdvanhornKILLspamspamCEDAR.NET>
writes:
{Quote hidden}

FCC Rules Online at http://hallikainen.com/FccRules
Lighting control for theatre and television at http://www.dovesystems.com

________________________________________________________________
GET INTERNET ACCESS FROM JUNO!
Juno offers FREE or PREMIUM Internet access for less!
Join Juno today!  For your FREE software, visit:
dl.http://www.juno.com/get/tagj.

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2001\06\08@151034 by David VanHorn

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>
>I/O ports are in input mode on reset, lines that are driving your
>printhead drivers are floating. You COULD get all printhead drivers on
>simultaneously during the time prior to setting the TRIS registers.
>Appropriate pull-up or pull-down resistors in front of the drivers can
>solve this.

You only need to worry about the burn pulse lines, but they should
definitely have a hardware pulse limiter .
When your $3 uP takes out a $50 print mech, it's a little disturbing.

Also helps when you breakpoint while the print pulse is active.


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I would have a link to http://www.findu.com/cgi-bin/find.cgi?KC6ETE-9 here
in my signature line, but due to the inability of sysadmins at TELOCITY to
differentiate a signature line from the text of an email, I am forbidden to
have it.

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2001\06\08@180316 by Alexandre Domingos F. Souza

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>You would also need to be able to "render" text, so some internal
>representation of a font is needed so you can build the line to print.
>try: http://mechs.epson.com/

       Maybe a good start would be an old terminal, recipt printer or fax, eh? :o)


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