There is provided an ink pressure regulator for regulating a hydrostatic pressure of ink supplied to an inkjet printhead. The arresting device has a carriage module and a finger carrier with the arresting finger, and at least one drive means for the adjustment of the arresting finger is formed by a servomotor activated by means of a measuring and controlling circuit of the control device. The base end of the body having at its end a rear recess is foldably pivotally attached by means of a support shaft to the base ends of both the one side-plate and the other side-plate.