Search page different title per results

For this to work, you will need to have your search results ordered by the post type.

function order_by_pt($where,$qry) {
  if (is_main_query() && $qry->is_search()) {
    global $wpdb;
    $where = $wpdb->posts.'.post_type DESC';
  }
  return $where;
}
add_action('posts_orderby','order_by_pt',1,2);

Then a Loop like this one will do what you want, if I understand you.

$type_title="";
while (have_posts()) { 
  the_post();
  // this is where the title is checked and printed
  if (get_post_type() !== $type_title) {
    $type_title = get_post_type();
    echo '<h2>Custom Post Type "'.$type_title.'" Results</h2>';
  }
  // switches are neater than a bunch of if/ifelses :)
  switch (get_post_type()) {
    case 'type_1' :
      //Style type_1 ?>
      <div id="type_1" <?php post_class(); ?>>    
        <div id="file-loader">
          <a href="https://wordpress.stackexchange.com/questions/103331/<?php echo get_content_link( get_the_content() ); ?>">
            <?php the_post_thumbnail(180, 230); ?>
          </a> 
        </div>
        <div id="file-hover"></div>
          <h4>
            <a href="https://wordpress.stackexchange.com/questions/103331/<?php echo get_content_link( get_the_content() ); ?>"><?php the_title(); ?></a>
          </h4>
      </div><?php
    break;
    case 'type_2' :
      //Do different styling
      echo '<p>',the_title(),'</p>';
    break;
    case 'some-other-type' :

    break;
  }
}

I formatted your code, put it is a Loop, and used a switch instead of an if/else chain.

That code should produce output like: