Patent GB-1322956-A (GB)
Title: Automatic moulding apparatus for producing ring-shaped doughnuts containing fillings
IPC: A21C11/16
Filed: 1970-10-21
Abstract: 1322956 Filled doughnuts R KANEKO and Y KANEKO 21 Oct 1970 [22 Oct 1969] 49949/70 Heading A2B [Also in Division B5] An annular doughnut is automatically moulded with an enclosed filling of bean or fruit jam, cream, of raw meat or fish paste, by the intermittent extrusion and cutting off of the filling, from an annular orifice into the dough which is intermittently extruded and cut off from an annular orifice located immediately above the filling orifice, the dough being delivered to its orifice by an intermittently or continuously rotated spiral blade S located within a dough delivery pipe 13 leading from a dough hopper 10, and the filling being intermittently delivered to its orifice by a reciprocating piston 50 fitted with a one way valve and located within a filling delivery pipe 25 leading from a filling hopper 20 located concentrically within the dough pipe and hopper 13, 10. In the Fig. 7c embodiment the diametrically divided halves 60, 60a of an annular mould (preferably made of polytetrafluoroethylene) rise and close around the dough and filling orifices to receive dough as a dough cutting sleeve 30 rises to open to permit extrusion from the dough orifice into which filling is then extruded from a filling orifice defined by movement of a sleeve 41a, against a return spring 44, away from a filling pipe flange 26 under the pressure of the filling. After return of the sleeve 41a to cut off the filling, the mould 60, 60a rises into alignment with the dough orifice and then descends to draw further dough around the inside of the filling as the dough is severed by downward movement of sleeve 30 to around the sleeve 41a. The mould 60, 60a then descends and opens to discharge the filled doughnut, either onto a conveyor for further processing (if made of yeast) or directly into a fryer. In the Fig. 8C embodiment, the filling orifice is defined between the flange 26 and a fixed disc 41 and the mould 60 is open at the base thereof. The dough is extruded for the lower end thereof to abut a flexible silicone rubber disc 45, the mould 60 is then closed around the dough as the filling is extruded and after the dough and filling are severed by descent of the sleeve (30) to around the disc 41, the mould 60 is lowered so that the lower dough end abutting the disc 45 is wrapped around the filling and the flexible disc 45 then deflects to permit passage of the doughnut during further lowering of the mould 60. In the Fig. 9c embodiment, a mould 60 is not employed the dough firstly being extruded to engage circumferential grooves of a sleeve 42 which is then downwardly urged, against a return spring 44, by the pressure of the filling to permit extrusion thereof. After return of the sleeve 42 by the spring 44 to close the filling orifice, the cutting sleeve 30 descends to sever the dough and complete the filled doughnut.  The apparatus is automatically operated in the required sequence from a cam shaft 80; the sleeve 30 and piston 50 respectively by cam actuated lever 35 and lever and link connection 54, A3, Al, the mould halves 60, 60a respectively being lowered and raised by a cam actuated bell crank 67, and opened and closed by gearing 62, 62a actuated by a cam reciprocated link 75; the spiral blade S is rotated from a worm and wheel drive S7, S8, intermittently engaged by a toothed clutch 59 which is brought into operation, against a return spring S17, by a solenoid energised from a cam actuated microswitch 100.