| 摘要 |
The present invention provides operation selecting control method and apparatus for shifter fork of a torchon lace machine in such a way that the shifter fork can sufficiently follow high-speed rotation without erroneous function. The switching apparatus is simple in structure. Pawls 23a and 23b acting as selector rods are pivoted to an elevatable member 20 that is a part of a driving means. The pawls can act on parts of a fork shaft 14 or shifter fork 11. Permanent magnets 22a and 22b are attached to the pawls, respectively. Solenoids 21a and 21b are mounted close to the pawls 23a and 23b, respectively, so that the solenoids can magnetically act on the pawls, respectively. When the pawls are moved into their operated positions or unoperated positions where they do or do not, respectively, act on the fork shaft 14 or shifter fork 11, the solenoids are energized to produce a repulsive magnetic field between each solenoid and the corresponding permanent magnet because of similar magnetic poles. Thus, the pawls which are selector rods are moved. When the pawls are not moved, the solenoids are deenergized. In this way, selecting operation are controlled. <IMAGE> |
