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Sherlock Ohms

Unjamming the Toner Hoppers

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TJ McDermott
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Blogger
Re: Toner measurement window
TJ McDermott   2/5/2014 1:04:33 AM
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"It's expensive to change the software"?  That's a Monkey statement, plain as day, the kind to make you fly off the handle.

studleylee
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Gold
Re: Toner measurement window
studleylee   2/4/2014 11:01:00 PM
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Fully understand that :-)

jlinstrom
User Rank
Gold
Re: Toner measurement window
jlinstrom   2/4/2014 6:55:28 PM
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my thoughts as soon as I read the problem description. I had the same prob. with an ADC that read bus noise while converting - change toa CMOS uP (8051), ask for a convert, go to sleep and wait for a 'convert. done' signal to awaken and read the ADC value.

William K.
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Platinum
Re: Toner measurement window
William K.   2/4/2014 6:42:20 PM
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Separating the fill and check process is certainly a very good alternative and it seems like it could have been a better solution. But I once suggested a change in some software only to be severly challenged "because it is expensive to change the program", and it would give upper managenment the impression that an error had been made, and the boss that I suggested it to was quite afraid of suggesting any change that cost any money. Instead they changed the assembly process a small amount and just ate the warranty costs, because that reflected on somebody else.

studleylee
User Rank
Gold
Toner measurement window
studleylee   2/4/2014 4:51:47 PM
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I wonder, maybe setting up a "quiet measuring" window where measurements are only done when the augur is off ie:

1) The auger would be turned turn off,

2) The piezo would be excited for measurement and settling of the toner.

3) If more was indicated, the auger does n turns.

then the cycle repeats 1..3

-Lee

William K.
User Rank
Platinum
The Hopper Bopper problem
William K.   1/27/2014 10:35:28 AM
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Good detective work indeed. Problems with incorrect gear engagement can be quite hard to detect, since most designers are no gear-train experts. Slipping gears and jamming gears are most often the result of not holding adequate tolerances on s few criticaql dimensions. But in the case of the printer I would suspect excessive variation in the sheetmetal structure supporting the gears. If that happens along with a bit of excess pitch-line runout, the gears will either slip or bind, depending on which way the variation has gone. If it is not possible to keep adeqaute tolerances in the parts then an adjustment has to be added, and an adjusting step added to the production process. That expense will usually convince some management that the production process needs to have the excess variation corrected.

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