Knitting machine

Abstract

There is provided a warp knitting machine with summing drive for the displacement of a guide bar in which at least one addition member is made operative by an eccentric cam which, with the assistance of a switchable coupling, is rotated 180° by a drive shaft. The mean rate of rotation of the drive shaft depends upon the main drive shaft and which rate, at the switching moment, is substantially reduced to 0. A sensor obtains the rate of rotation and the turning angle position of the main shaft and provides an appropriate sensor signal. A motor control mechanism for an electric motor includes an input port for the sensor signal. In addition to storing at least one movement curve, which is read out dependent upon the angular position of the main shaft for the formation of a control signal, and which has at least one segment of reduced angular rotational speed, the machine is provided with synchronization means for stopping the rotation in timely correspondence with the switching moment

1 . A warp knitting machine with summing drive for the displacement of a guide bar in which at least one addition member is made operative by an eccentric cam which, with the assistance of a switchable coupling, is rotated 180° by a drive shaft whose mean rate of rotation depends upon the main drive shaft and which rate, at the switching moment, is substantially reduced to 0, comprising a sensor which obtains the rate of rotation and the turning angle position of the main shaft, said sensor providing an appropriate sensor signal; an electric motor; a motor control mechanism having an input port for the sensor signal; data storage for at least one movement curve which is read out dependent upon the angular position of the main shaft for the formation of a control signal, said curve having at least one segment of reduced angular rotational speed; and synchronization means for stopping the rotation in timely correspondence with the switching moment.  
     
     
         2 . A warp knitting machine according to    claim 1   , wherein said motor control mechanism includes means for changing said movement curve.  
     
     
         3 . A warp knitting machine according to    claim 1   , wherein said sensor includes means for adjusting the reduced rotational speed of said at least one segment with respect to the timing of the switching moment.  
     
     
         4 . A warp knitting machine according to    claim 1   , further comprising a coupling which includes at least one groove in a transmission shaft driven by said electric motor and at at least the switching moment, a knob falls into the groove which is rotatable about the fulcrum of the eccentric cam and after 180° of rotation is removable from the groove.  
     
     
         5 . A warp knitting machine according to    claim 1   , further comprising a summing drive which includes a mirror cam disc and an addition member.