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Automatic developing apparatus for photosensitive lithographic printing plates

  • US 5,701,542 A
  • Filed: 09/30/1996
  • Issued: 12/23/1997
  • Est. Priority Date: 09/29/1995
  • Status: Expired due to Fees
First Claim
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1. An automatic developing apparatus for photosensitive lithographic printing plates, comprising a development vessel storing a plate developer and a replenishing apparatus for replenishing a predetermined amount of development replenisher in accordance with an electric conductance of the plate developer, the replenishing apparatus comprising:

  • an electric conductance sensor detecting the electric conductance of the plate developer;

    a delivery device delivering the development replenisher into the development vessel;

    a timer detecting an elapsed time from replenishment of the development replenisher; and

    a control device for setting a reference electric conductance and for controlling the delivery device to replenish the development replenisher when the electric conductance detected by the electric conductance sensor has fallen below the set reference electric conductance, the control device calculating a carbon dioxide exhaustion replenisher ratio for replenishing the development replenisher in accordance with the elapsed time and the predetermined amount of the development replenisher.

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