Magento: Set Children of Configurable Products: Not Visible

<pre><?php

include 'app/Mage.php';
Mage::app();
Mage::app()->setCurrentStore(0);

$confs = Mage::getResourceModel('catalog/product_collection')
    ->addAttributeToFilter('type_id','configurable');

$prods = array();

foreach ($confs as $conf) {

    $simps = Mage::getModel('catalog/product_type_configurable')
        ->getUsedProducts(null, $conf);

    foreach ($simps as $simp) {

        if ($simp->getVisibility() != 1) {

            echo $simp->getId() . " : " . $simp->getVisibility() . "\n";
            $prods[] = $simp->getId();
        }
    }
}

Mage::getSingleton('catalog/product_action')->updateAttributes(
    $prods,
    array("visibility" => 1),
    0
);