Control of jig velocity by control of hauling drum parameters for automatic squid jigging machine

The calculated velocity of a jig hauled with a commercial hexagonal drum an d a regular nonagonal drum on an automatic squid jigging machine, was compa red with the measured velocity. The measured and calculated leader line vel ocities were found to be in agreement, however, the calculations failed to reproduce the vibrations that were observed in the leader line due to jiggi ng. The variations in jig velocity for a constant velocity drive were small for the regural nonagonal drum, which had a hauling effect similar that of a c ylinder, whereas the variations were marked for the hexagonal drum, which w as rhombic. It was found that when using an accelerated drive with the hexa gonal drum, the guide roller needs to be set appropriately in order to incr ease the jigging effect. To induce the magnitude of jigging required for catching squid requires a r otational velocity of 20-110 rpm, besed on manual rotaion of hauling drum. In the operating conditions in this study using a 0.4 kW motor, it was not possible to vary jig velocity in a single rotation of the hauling drum.