simple wiring - but can't figure it out!

Discussion in 'The Projects Forum' started by supervineboy, Apr 21, 2009.

  1. supervineboy

    Thread Starter New Member

    Jun 16, 2005
    2
    0
    I'm stumped, but shouldn't be as this SHOULD be simple!
    I'm making a label dispenser, and want it to operate in this manner:
    Operator presses foot switch, and a motor turns on and pulls on the label backing, dispensing the label, which rides against a micro switch.
    After a few seconds, the label is fully dispensed and there's nothing left to ride on the micro switch, so the thing shuts off.
    Hit the foot switch again, and another single label is dispensed.

    Any idea on what switches I need! type, model #'s, etc.
    Thanks,
    Bob
     
  2. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    Why don't you post some photos of your label dispenser in operation?

    What is the voltage & current or power rating of the dispenser?
     
  3. nucleargungus

    Member

    Apr 6, 2009
    23
    1
    Whats a label like 4 thousandths of an inch thick? You have a microswitch that can tell the difference of 0.004"? Use a pic and a stepmotor to move the length of the label... like a printer. Or you could use a light sensor if your backing material is translucent and your labels are opaque and you use a bright light.

    Robert
     
  4. wollybyte

    Member

    Apr 5, 2009
    15
    0
    your simple job made more simpler :)

    wire according to the schematic
    you can avoid the relay for small motors
     
  5. supervineboy

    Thread Starter New Member

    Jun 16, 2005
    2
    0
    the paper sensing switch is a micro switch mounted such that the edge of the paper trips it. Paper is quite stiff when it's only sticking out 1/4", and will easily trip a switch. The thickness of the poper doesn't matter.
     
  6. KMoffett

    AAC Fanatic!

    Dec 19, 2007
    2,574
    230
    Something like this. You didn't say if the motor was AC or DC, but this will work with either...with the correct relay. The STOP microswitch is closed when a label is under it. The START is the foot switch that is pressed and held until the new label moves under the microswitch. If the foot switch is held down the dispenser does not stop.

    Ken

    OOPS! Just realized I duplicated woolybyte's circuit. :rolleyes:
     
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