Structure of dough preparation machine

A dough preparation machine, comprising a power unit, which drives, via a rotational speed mechanism, a helical screw shaft, the helical screw shaft being arranged to extend into a dough chamber, a jet nozzle being arranged on an end of the dough chamber such that the dough is positionable into the dough chamber and driven and compressed through rotation of the helical screw shaft to be discharged through the jet nozzle, the dough chamber being provided with a bearing that is set at a location above the helical screw shaft, the bearing receiving and coupled to an auxiliary dough driver, which is driven by the power unit and the rotational speed mechanism,

• wherein the auxiliary dough driver comprises, at least, a rotary axle, the rotary axle comprising a shaft hole extending therethrough in an axial direction, the rotary axle being provided with at least one side opening that extends therethrough in a radial direction, the rotary axle being provided, in an outer circumference thereof, two side slots extending in a longitudinal direction and on two sides of the side opening;
• two movable blades, which each comprise a driving plate in the form of an elongated plate and a retention ring, the two movable blades being respectively insertable into the rotary axle from two opposite sides thereof such that the retention rings are received in the side opening and the two driving plates are respectively received in the two side slots, a central shaft being received in and extending through the shaft hole of the rotary axle and also extending through the retention holes of the two movable blades, the central shaft being arranged to drive the rotary axle to rotate, a fastening assembly fixing the auxiliary dough driver to the bearing of the dough chamber;
• and
• the dough chamber comprises a sidewall at a location adjacent to the auxiliary dough driver and forms a circular arc, wherein when the auxiliary dough driver is in rotation, one of the movable blades that is moving to pass through the circular arc sidewall of the dough chamber is compressed inward thereby so as to have the driving plate thereof retracted inward and received in a corresponding one of the side slots of the rotary axle, and wherein the one of the movable blades, when retracted inward, drives another one of the movable blades outward through the retention rings so that the driving plate of said another one of the movable blades is caused to project out to drive and poke the dough until being further rotated to reach the circular arc sidewall of the dough chamber to be compressed inward thereby to thereby complete a cycle of extension-retraction based operation of dough kneading and poking.