Tapping Unit with Dynamic Spring Release for Tap Retraction

The patent applies dynamics by making the spring-loading means selectively active rather than continuously engaged. The first spring-loading means is activated only during the first particular penetration stroke through the interaction of locking elements with inclined surfaces, and becomes inactive during the second particular penetration stroke. This dynamic engagement allows the system to provide high retention force when needed while permitting extended retraction movement when the tap is properly engaged, resolving the contradiction between protecting the tap and allowing sufficient retraction amplitude.

The patent resolves this contradiction by dynamically controlling the engagement state of the spring-loading means. During the first penetration stroke, the locking elements engage with inclined surfaces to activate the spring, providing strong retention in a compact configuration. During the second penetration stroke, the locking elements disengage, allowing the master template to retract over a much larger amplitude without being constrained by the stiff spring. This dynamic switching enables both compact design and large retraction amplitude.

The patent uses dynamic control of the spring-loading means engagement to protect thread orientation accuracy. During the first penetration stroke, the active spring provides controlled retrograde movement to accommodate misalignment without forcing incorrect orientation. During the second penetration stroke, when the tap should be properly engaged, the inactive spring allows free retraction without exerting forces that could cause oblique penetration. This dynamic engagement strategy protects both against excessive thrust and maintains manufacturing precision.