| 摘要 |
<p>The mechanism, consists of first and second drive rollers which interact with counter-rollers (42, 44, 46, 16) mounted on arms (48, 50, 52) which are able to pivot about a common axle (22) against the effort of return springs (26, 54, 56, 58) fixed to a support (32). At least one of the counter-rollers has an intermediate counter-roller (44) on a lever (50) which is pivoted to the common axle, and two outer counter-rollers (42, 46) situated on either side of it and mounted on their own levers (48, 52). This enables the items of main to make contact with at least one and up to three counter-rollers, depending on its thickness. The levers of the two outer counter-rollers are connected by an intermediate element (66).</p> |
