Jck57's Full Auto Scanner Scheme #6

[M@rtijn]

Nice, that loc-line piece resembles a scorpion's tail.
Why not call this prototype Jck57's Scorpio Scanner.

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[jck57]

Yeah. Have a scorpion with cameras for eyes, holding a book in his pinchers while turning a page with his tail.

[M@rtijn]

Yes, that picture will make a cool icon for the scanner.

If any revision is needed to be made to the lifter it will probably occur further on the build as things change.

What do you have in mind to build next?

[jck57]

Yes, I agree we can leave the lifter alone for now.

Today I'm reproducing parts for the other gearmotor assembly. About as fun as ditch digging.

[M@rtijn]

An idea is nothing until it is actually build, only then it becomes clear.

[jck57]

Made hardware for the other side. Next thing is to figure out the relay logic. Anybody here good with making ladder diagrams?

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[M@rtijn]

How about using a tumble dryer relay pcb module?
You can also check ideas at www.instructables.com

[jck57]

Motor Control Outline

M T = top of page motor
M B = bottom of page motor
M C = camera trigger motor
RT, RB, RC = 24vdc DPDT motor control relays
ST SB SC = SPDT Microswitches to sense position of the 6vdc gearmotors

MC is a gearmotor that mechanically triggers both cameras and has a microswitch SM to shut off MC and restart the page turning cycle.

All motor control relays are wired so that when the motor power is off, motor leads are shorted together. This is so the gearmotor stops suddenly without coasting down.

Sequence of operation:
Cameras fire. SC energizes RB which starts MB which pulls up wedge and lifts corner of page. SB engergizes RT which starts MT which pulls up wedge and flips page. MB runs until the wedge drops and SB shuts motor off. MT runs until its wedge drops and ST shuts motor off. NO contacts on RT make as the motor shuts off and start MC. MC triggers both cameras. SC operates RC which shuts down MC and energizes RB.

[jck57]

Had to add a couple more relays (SCR, STR) to handle the DPDT functions of microswitches SC and SR. Also added another microswitch (SX) to MB. One switch starts MT and the other shuts off MB at the end of cycle when the wedge drops.

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[jck57]

Saw some problems with the previous schematic. When the cam opens the switch to stop the motor, the switch will stay open. The new schematic should correct this problem but only if the cams have progressively longer open durations in the following order from shortest to longest: SB, SCR, STR, SX. Somebody tell me if this doesn't look right. As in the previous drawing, the center line is ground.

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