| 摘要 |
A reading needle is slidingly supported in a force amplifying bar which is automatically moved up and down and the reading needle reads nonperforated and perforated points of a pattern card. In the case of a perforated point, a pivotal lock member biassed by a spring remains in a first position and pushes a draw arm of a correcting element downwardly unless this draw arm is already in a downward position. When the reading needle reads a nonperforated point, it is moved within the force amplifying bar by the pattern card during forward movement of the force amplifying bar. A sloped surface of a slot in the lock member slides over the head of the reading needle and swings the two-arm lock member to a second position in which one lock member arm reaches within the active range of an offset portion of a second draw arm and tilts the correcting element, whereby a cam surface of a draw hook is supported on an arm of the correcting element. This apparatus is particularly suited for control of shed-forming machines of the Hattersley system. |
