Food or beverage preparation machine
The present invention is directed to a home food or beverage preparation machine ( 1 ) comprising a mechanical part which is mobile between at least a first and a second position. The machine ( 1 ) comprises an actuator comprising a wire ( 13 ) made of a shape memory material. This wire ( 13 ) has a retracted state and an extended state, and the actuator is configured to move the mechanical part to or maintain the mechanical part in one of said first and second positions by retraction of the wire. Any mobile part of a home food or beverage preparation machine, and more particularly a valve assembly or a mobile plate ( 22 ) for clamping an ingredient package may thus be moved instantaneously without noise between its different positions.
1. A food or beverage preparation machine comprising a valve assembly, the valve assembly is mobile between a first position, a second position, and a third position,
the machine comprises a first fluid line and a second fluid line, wherein the first position closes both the first fluid line and the second fluid line, the second position closes the second fluid line with the first fluid line open, and the third position closes the first fluid line with the second fluid line open, the machine further comprises a wire made of a shape memory material, the wire having a retracted state and an extended state, the wire is configured to move the valve assembly to or maintain the valve assembly in one of the first, second, and third positions by retraction of the wire, the wire follows through most of a length of the wire a rigid channel provided in the machine,
the machine further comprises an ingredient receptor, the ingredient receptor having a cavity configured for receiving an ingredient package, the ingredient receptor further comprising a movable plate configured for clamping the ingredient package within the cavity, the cavity and the movable plate movable relative to each other to open and close the ingredient receptor, and a latch maintains the movable plate in the second position after retraction of the wire; and
wherein the wire is configured such that a change from the extended state to the retracted state and vice versa is caused by a change of temperature of the wire.
2. The machine according to claim 1 , wherein the machine is configured so that when the wire is in the extended state the valve assembly is in the first position, and when the wire is brought to the retracted state the wire pulls the valve assembly into the second position.
3. The machine according to claim 1 , comprising a spring which biases the valve assembly to return towards the first position.
4. The machine according claim 1 , wherein the valve assembly comprises a fluid valve assembly.
5. The machine according to claim 1 , wherein the wire comprises a first segment of wire and a second segment of wire both made of a shape memory material, the wire is configured to move or maintain the valve assembly in the second position upon retraction of the first segment of the wire and in the third position upon retraction of the second segment of wire.
6. The machine according to claim 1 , the machine comprising a fluid outlet line, and the valve assembly is configured to select by which of the first and second lines the fluid outlet line is supplied with fluid.
7. The machine according to claim 1 , wherein the valve assembly comprises a lever fixed to a rocker body, the machine comprising a base on which the rocker body is mounted in order to rock between at least one neutral position corresponding to the first position, and two selective closed-off/open positions of the first and second lines, the selective closed-off/open positions corresponding to the second and third positions and comprising a closed-off position of the second fluid line and an open position of the first fluid line, and an open position of the second fluid line and a closed-off position of the first fluid line.
8. The machine according to claim 1 , wherein the first fluid line comprises an element selected from the group consisting of:
a heater module configured to heat the first fluid flowing through the first fluid line to a temperature above 70° C.;
a single fluid tank configured to feed the first fluid line and the second fluid line with fluid; and
a single pump configured to feed the first fluid line and the second fluid line with fluid.
9. The machine according to claim 1 , wherein the movable plate is configured to move around a rotation axis, and the wire is attached to the movable plate at an offset from the rotation axis.
10. The machine according to claim 1 , wherein the wire is attached to the valve assembly by pinching the wire between a washer and a surface of the valve assembly, or between a head of a rivet and a surface of the valve assembly.
11. The machine according to claim 1 , wherein the rigid channel comprises at least one curve, wherein the at least one curve of the rigid channel has an inner radius of one centimetre or more.
12. The machine according to claim 1 , wherein the machine comprises a machine body comprising a head enclosing the valve assembly, and the channel is formed at least over a portion of a length of the channel by the machine body and a side cover, and wherein an interface between the machine body and the side cover comprises grooves in which the side cover is engaged.
13. The machine according to claim 9 , wherein the offset between the rotation axis and the point where the wire is attached to the movable plate is configured to transform force generated by retraction of the wire into a torque which biases the valve assembly toward at least one of the second position or the third position.