the following description is of the best - contemplated mode of carrying out the invention . this description is made for the purpose of illustrating the general principles of the invention and should not be taken in a limiting sense . the scope of the invention is best determined by reference to the appended claims . referring to fig1 , the coffee maker in accordance with a first embodiment of the invention includes a main body 10 and a movable module 20 . the main body 10 includes a liquid container 11 , a frame 12 , a base 13 , and a cup holder 14 , wherein the frame 12 and the cup holder 14 are disposed on the base 13 and the liquid container 11 is disposed on the frame 12 . the movable module 20 includes a transmission unit 21 and a driving unit 22 , and the driving unit 22 can be a motor , a spring , or any unit capable of generating power . the transmission unit 21 is disposed in the base 13 . the driving unit 22 generates a power to translate and / or rotate the cup holder 13 through the transmission unit 21 . referring to fig2 and fig3 , the transmission unit 21 includes a linkage 219 , a linking part 218 , a gear 214 , a linking part 216 , and a ring gear 212 . one end of the linkage 219 connects to the driving unit 22 , and the other end of the linking part 219 connects to the center of the gear 214 through the linking part 218 . the gear 214 engages the inner peripheral surfaces of the ring gear 212 , and the driving unit 22 generates a rotation force to drive the gear 214 to move along the inner peripheral surfaces of the ring gear 212 through linking parts 218 and the linkage 219 ( shown as arrow a in fig3 ). the linking part 216 connects the gear 214 and the cup holder 14 so that the driving unit 22 can further drive the cup holder 14 through linking part 216 . one thing to be noted , the linking part 216 does not connect to the center of the gear 214 but eccentrically connects to the gear 214 . therefore , when the gear 214 moves along the inner peripheral surfaces of the ring gear 212 , the linking part 216 simultaneously translates and rotates . the motion trace of the linking part 216 depends on the location of the linking part 216 , and the motion trace 40 in fig4 is shown for example without limiting the implementation of the invention . because the cup holder 14 connects to the linking part 216 , the motion trace of the cup holder 14 is same as that of the linking part 216 . referring to fig5 , the method of making coffee is as follows : providing a coffee cup set 30 including a filter cup 34 , a filter paper 32 , a coffee powder ( not shown ), and a coffee cup 26 ; putting the coffee cup set 30 on the cup holder 14 and adding hot water in the liquid container 11 ; adjusting and turning on the movable module 20 to drive the cup holder 14 so that the coffee cup set 30 simultaneously translates and rotates . due to the continuously changing motion trace of the coffee cup holder 30 with respect to the liquid container 11 , a good coffee making effect is obtained . furthermore , the frame 12 is extendable and its height can be adjusted according to the height of the coffee cup set 30 or other practical need . furthermore , the liquid container 11 can include a control valve to control a volume of the liquid such as hot water or milk entering the coffee cup set . in an embodiment of the invention , when the driving unit 22 is a motor , the transmission unit 21 can include a deceleration gear train ( not shown ) to reduce the output speed from the motor and to increase the output torque at the same time for driving the cup holder 14 and the coffee cup set 30 . referring to fig6 , a coffee maker in according with a second embodiment of the invention is shown . in this embodiment , a transmission unit 21 ′ connects to a frame 12 ′, and a driving unit 22 ′ drives the frame 12 ′ rather than the cup holder 14 ′ through the transmission unit 21 ′. this concept can similarly generate a continuously changing motion trace to obtain an evenly coffee making effect . because other parts are similar with or identical to those of the first embodiment , their detail description is omitted . while the invention has been described by way of example and in terms of preferred embodiment , it is to be understood that the invention is not limited thereto . to the contrary , it is intended to cover various modifications and similar arrangements ( as would be apparent to those skilled in the art ). therefore , the scope of the appended claims should be accorded the broadest interpretation so as to encompass all such modifications and similar arrangements .
a coffee maker includes a main body and a movable module . the main body includes a cup holder , a liquid container , and a frame . the cup holder carries a coffee cup set . the liquid container is disposed on the cup holder for accommodating a liquid . the frame supports the liquid container . the movable module connects the cup holder or the frame to translate and rotate the frame for more evenly melting the coffee .