FORM 2
THE PATENTS ACT, 1970 (39 of 1970) & THE PATENTS RULES, 2003
COMPLETE SPECIFICATION (See section 10, rule 13) 1. Title of the invention: ROTATING DEVICE FOR A FOOD PROCESSOR
2. Applicant(s)
NAME NATIONALITY ADDRESS
BAJAJ ELECTRICALS LTD Indian 45/47, Veer Nariman Road,
Mumbai, Maharashtra 400 001,
India

TECHNICAL FIELD [001] The present subject matter relates in general to a food processor and in particular, to a rotating device for a food processor.
BACKGROUND [002] A food processor is an appliance used to facilitate repetitive tasks in the preparation of food and usually refers to an electric-motor-driven appliance. Food processors can carry out several repetitive tasks such as cutting, grinding, chopping, blending, mixing, beating etc. For example, a mixer is a type of food processor that cuts and mixes materials, such as food materials, in a container. A food processor has a container which comprises a blade-like element to grind or mix the material. The blade-like element is coupled to a shaft which in turn is coupled to a motor’s shaft which rotates the blade-like element.
[003] Generally, the blade-like element, also referred to as the blade, is coupled at the bottom of the container and is rotated by an existing motor at different speeds, usually a very high speed to grind or mix or cut the material in the container. The motor, in general, has a round circular stator in which a rotor is placed. The stator and/or rotor have electrical winding over them. When electric current is passed in the windings of the rotor using commutators and carbon brush and simultaneously electric current is also passed in the stator windings. The electric current in the stator windings create magnetic fields around the stator. Further, due to the current flowing in the stator winding, a force is exerted on conductors of the stator and rotor windings which rotates the rotor. A motor shaft is coupled to the rotor and the blade assembly. The rotation of the rotor rotates the motor shaft which further rotates the blade assembly of the food processor. In other topologies the stator and rotor may or may not have the field windings energized by electric current but energized by permanent magnets or by methods of reluctance, induction or hybrid concepts.
[004] The current electric motor involves a plurality of components which individually have to be manufactured and should be coherent with the other parts with

respect to their electrical, mechanical, and thermal domains. Further, there needs to be a very close tolerance between the components for optimal performance of the electric motor. Thus, the manufacturing of the components possesses a very high challenge and the components must be precise and accurate in terms of electric, mechanical, and thermal properties. Due to presence of several moving parts, the electric motor makes a lot of noise and is in constant need of lubrication. Furthermore, it increases the complexity of entire setup.
BRIEF DESCRIPTION OF DRAWINGS [005] The detailed description is described with reference to the accompanying figures. In the figures, the left-most digits of a reference number identify the figure in which the reference number first appears. The same numbers are used throughout the drawings to reference, like features and components.
[006] Figure 1 illustrates components of the rotating device in accordance with an example embodiment of the present subject matter;
[007] Figures 2a-2d illustrate components of the rotating device, in accordance with another embodiment of the present disclosure;
[008] Fig. 3a-3c illustrates working of the rotating device, in accordance with another embodiment of the present disclosure;
[009] Fig. 4a illustrates an exploded view of a food processor, in accordance with an embodiment of the present disclosure; and
[0010] Fig. 4b illustrates a sectional perspective view of the food processor, in accordance with an embodiment of the present disclosure.
DETAILED DESCRIPTION [0011] The present subject matter provides a rotating device for a food processor which uses less components as compared to the conventional motor and less precision is required to manufacture the components of the rotating device. According to the present subject matter, the rotating device of the present subject matter comprises a circular disc having a driving shaft. The driving shaft is to couple to a blade-like element of the food processor. The rotating device further comprises a longitudinal

member which is coupled to the circular disc via a motion conversion assembly. The motion conversion assembly comprises a shaft coupler coupled with the longitudinal member such that the shaft coupler moves longitudinally along with the longitudinal member when the longitudinal member is in longitudinal motion. The motion conversion assembly further comprises a cam member coupled with the shaft coupler such that the cam member moves longitudinally along with the shaft coupler. The cam member comprises a groove to accommodate a protrusion of the circular disc and the longitudinal movement of the cam member causes the rotation of the circular disc. The cam member and the protrusion are magnetic, and the magnetic polarity of the cam member is same or opposite to the magnetic polarity of the protrusion on the circular disc (216).
[0012] Thus, the rotating device of the present subject matter has very less components and less moving parts. The construction, as will be described hereafter, is very simple and robust. Further, as there are few moving parts, less lubrication is needed and there is less wear and tear.
[0013] Although the subject matter has been explained in the context of figures that depict a household food processor, it will be understood that the subject matter may be extended to any food processor in which a rotating device is employed to rotate blade-like element of the food processor, such as an industrial food processor. [0014] Aspects of the present subject matter related to the rotating device for a food processor will now be described in detail in conjunction with the following figures. It should be noted that the description and figures merely illustrate the principles of the present subject matter along with examples described herein and should not be construed as a limitation to the present subject matter. It is thus understood that various arrangements may be devised that, although not explicitly described or shown herein, embody the principles of the present subject matter. Moreover, all statements herein reciting principles, aspects, and specific examples thereof, are intended to encompass equivalents thereof.

[0015] Figure 1 shows components of a rotating device 100 for rotating a blade-like element 102 of a food processor in accordance with an example implementation of the present subject matter. The rotating device 100 comprises a longitudinal member 104 and a circular disc 106 having a driving shaft 108. The driving shaft 108 is to couple to the blade-like element 102 of the food processor. A motion conversion assembly 110 is coupled to the longitudinal member 104 and the circular disc 106 to translate a longitudinal motion of the longitudinal member 104 into a circular motion of the circular disc 106. The circular motion of the circular disc 106 causes the rotation of the driving shaft 108. The rotation of the driving shaft rotates the blade¬like element 102 of the food processor. The rotation of the blade-like element 102 may grind/slice/mix materials contained in the food processor.
[0016] Figure 2a illustrates an exploded view of the of a rotating device 202 in accordance with an example of the present subject matter. The rotating device 202 comprises a longitudinal member 204, similar to the longitudinal member 104. The rotating device 202 further comprises a first coil 206 and a second coil 208. The first coil 206 and the second coil 208 may be wound on a bobbin (not shown here) which supports the coil windings on the first coil 206 and the second coil 208. The longitudinal member 204 is placed between the first coil 206 and the second coil 208 (shown in Figure 2b). The first coil 206 and the second coil 208 are energized by passing electric current, thus, creating magnetic fields around the first coil 206 and the second coil 208. The longitudinal member may be made up of magnetic material, or exhibit magnetism due to the presence of electric current in it thru induction/conduction or may be permanently magnetized such that the magnetic field of the first coil 206 and the second coil 208 exerts a force on the longitudinal member 204. Further, in an example, the longitudinal member may be temporarily magnetized by providing windings around or in the proximity of the longitudinal member 204 and passing an electric current through the windings to result in a unidirectional motion of the longitudinal member 204. In an embodiment, the current is fed in parallel manner. In another embodiment, the current is fed in serial manner. In

continuation, the current is fed either from different sources or a common source to form a combined magnetic field, thus resulting in unidirectional motion of the longitudinal member 204.In an example, the current is passed in the first and the second coil such that first coil attracts the longitudinal member 204 and the second coil 208 repels the longitudinal member 204, thus moving the longitudinal member in to and fro manner in a direction 210. In another example, the current is passed in the first and the second coil such that first coil repels the longitudinal member 204 and the second coil 208 attracts the longitudinal member 204, thus moving the longitudinal member in to and fro manner in the direction 210.
[0017] A motion conversion assembly translates the longitudinal motion of the longitudinal member 204 into a circular motion of a circular disc 216. The motion conversion assembly comprises a shaft coupler 212 coupled with the longitudinal member 204. In an example, the shaft coupler 212 is shaped as a ring, such that the longitudinal member 204 passes along the center of the ring. In another embodiment, the shaft coupler 212 may of regular or irregular shape. The shaft coupler 212 is coupled with the longitudinal member 204 such that the shaft coupler 212 moves longitudinally along with the longitudinal member 204.
[0018] Further, a cam member 214 is coupled to the longitudinal member 204. The cam member 214 also moves with the shaft coupler 212. The circular disc 216 (having a driving shaft not shown) is coupled with the cam member 214 through a protrusion 218. The motion conversion assembly converts the linear or longitudinal movement (to and fro movement) of the longitudinal member 204 to rotatory/circular motion of the circular disc 216. The rotation of the circular disc 216 rotates the driving shaft which in turn may rotate a blade-like element of the food processor. [0019] Figure 2b discloses a cross sectional view of the rotating device 202 of the present subject matter. As explained earlier, the rotating device 202 comprises a longitudinal member 204 and the first coil 206 and the second coil 208. In an example, a cross sectional view of a first bobbin 220-1 and a second bobbin 220-2 is shown in Figure 2b. The first bobbin 220-1 and the second bobbin 220-2 are used to

support the windings of the first coil 206 and the second coil 208, respectively. In other words, the windings of the first coil 206 and the second coil 208 are wound on the first bobbin 220-1 and the second bobbin 220-2, respectively. Further, a first core 222-1 and a second core 222-2 may also be provided in the first coil 206 and the second coil 208 to increase the magnetic permeability of the first coil 206 and the second 208. In an example, the first core 222-1 and the second core 222-2 may have slots 224 in which the longitudinal member 204 may move. In an embodiment, the first core 222-1 and second core 222-2 may not be present and are substituted by an aircored coil. In another embodiment, the first core 222-1 and second core 222-2 are made up of non-magnetic material for ensuring space in the coils.
[0020] In an example, the first bobbin 220-1, the second bobbin 220-2 are made up of insulation materials (or in some cases can be only an insulated coating metal formers), the first core 222-1, and the second core 222-2 may be made up of metals, such as steel, iron, soft iron, special alloys, laminated silicon steel, moly permalloy and rubber or plastic magnet compounds etc. Further, in an example, the winding of the first coil 206 and the second coil 208 may be made up of magnet wires, copper, Aluminum or any conductive materials and a layer of insulation, such as paper or plastic or any insulating materials, may be used between the coil windings. Further, in an example, the circular disc 216, the shaft coupler 212, the cam member 214, the longitudinal member 204 may be made up of metals, alloys, steel and even plastic etc. [0021] Figure 2c shows the exploded side view of the rotating device 202 comprising a driving shaft 224. The rotating device 202 is shown with the first coil 206 and the second coil 208. Further, the longitudinal member 204 is also shown in the Figure 2c. A shaft coupler 212 is shown coupled with the longitudinal member 204. Also, a cam member 214 is shown in the figure 2c, which is to couple the shaft coupler 212 with the protrusion 218 in circular disc 216, thus, effectively coupling the shaft coupler 212 with the circular disc 216.
[0022] The circular disc 216 is shown with the driving shaft 224 which may couple to a blade-like element, interchangeably referred to as blade in the present description,

of a food processor. The longitudinal motion of the longitudinal member 204 is translated to a rotatory motion, via the cam member 214, and the circular disc 216 is rotated. The rotation of the circular disc 216 rotates the driving shaft 224 which may further rotate the blade-like element of the food processor.
[0023] Figure 2d shows components of the rotating device 202 placed within a housing and coupled to a container 232. The container 232 has a blade-like element 230 which is coupled with the driving shaft 224. In an example, the container 232 may comprise the blade 230 at its base and the container may be placed at the top of the rotating device 202 coupling the driving shaft 224 with the blade 230. The rotation of the driving shaft 224 rotates the blade 230 and a material contained in the container 232 may be mixed and blended.
[0024] Figure 3a-3c shows the rotating device, to further elaborate the working of the rotating device 100 in accordance with the present subject matter. Figure 3a-3c illustrates a conversion of the longitudinal movement of the longitudinal member 204 into a circular motion of the circular disc 216. In an example, in the figure 3a, the cam member 214 is shown with a groove 226 which may enclose the protrusion 218 of the circular disc 216. The protrusion 218 is free to move in a direction 228 inside the groove 226 of the cam member 214
[0025] Further, in an example, the sides of the cam member 214 may have protrusion to couple the shaft coupler 212. The shaft coupler 212 may be coupled to the cam member 214 such that the cam member 214 moves along with the shaft coupler 212. When the longitudinal member 204 moves in horizontal direction, the cam member 214 also moves horizontally along with the longitudinal member 204.
[0026] In operation, an alternating current (AC), a direct current (DC), a pulsating voltage or any waveform may be cyclically applied by using electronics or any mechanical arrangement. The electric current is passed in the first coil 206 such that a magnetic field is created due to the first coil 206 that repels the longitudinal member 204 in a direction 232. In an example, the longitudinal member 204 may be permanently magnetized or comprises a magnetic material such that the longitudinal

member 204 experiences a magnetic force when placed in a magnetic field. Further, temporary magnetization of the longitudinal member 204 may also be done by providing a winding over the longitudinal member and passing electric current through the windings. Simultaneous to the passing of the electric current in the first coil 206, the electric current is also passed in the second coil 208 such that the second coil attracts the longitudinal member 204. Thus, the longitudinal member 204 moves in the direction 232. The cam member 214 also moves along with the longitudinal member 204 in the direction 232. As the cam member 214 moves from the leftmost position 234 in the figure 3a to a position 236 as shown in figure 3b, the protrusion 218 also moves from a position 238 in figure 3a to a position 240 as shown in figure 3b. As the protrusion 218 moves from the position 238 to the position 240, the circular disc 216 is rotated in clockwise direction 242 as shown in the figure 3b. Further, it should be noted that the position of the protrusion 218 inside the groove also changes while the cam member 214 moves from the position 234 in figure 3a to the position 236 in figure 3b. As the cam member 214 moves to the rightmost position 244, the circular disc 216 is rotated further in clockwise direction 242. [0027] Thereupon, the current in the first coil 206 and the second coil 208 is reversed, such that the first coil 206 attracts the longitudinal member 204 and the second coil 208 repels the longitudinal member 204. In other words, the magnetic polarity of the first coil 206 and the second coil 208 is changed. The longitudinal member 204 moves in a direction 246 and the protrusion 218 moves more downward from the position shown in figure 3c and the circular disc 216 completes one full revolution. Further, in this way, by controlling the frequency of changing of the magnetic polarity of the first coil 206 and the second coil 208, the circular disc 216 may be rotated at a desired speed. The rotation of the circular disc 216 rotates the driving shaft 224 which further rotates the blades of the food processor.
[0028] In an embodiment, the circular disc 216 may be rotated in anti-clockwise direction when the first coil 206 attracts the longitudinal member 204 and the second

coil 208 repels the longitudinal member 204 during starting of the operation in figure 3a.
[0029] In an example the rotating device 202 may operate even if the longitudinal member 204 is not magnetized. In such cases, the first coil 206 and the second coil 208 are energized so that the longitudinal member 204 experiences a force and move in a to and fro manner, leading to rotation of the circular disc 216. In another embodiment, the rotating device 202 may operate even if one of the coils out of the first coil 206 and the second coil 208 are not energized. In such cases, either the first coil 206 and the second coil 208 may alternatively attract and repel the longitudinal member 204 to rotate the circular disc 216. In yet another embodiment, the rotating device 202 may operate even if one of the coils out of the first coil 206 and the second coil 208 is not physically present within the rotating device 202. In such situations the to and fro movement of the longitudinal member 204 is ensured through one of the energized coils. Furthermore, in such situations, a spring may be used to ensure the to and fro movement of the longitudinal member 204. In operation, the longitudinal member 204 may be repelled by the first coil 206 in one cycle and may be attracted by the first coil in the next cycle. The spring may aid in pushing the longitudinal member 204 when the longitudinal member 204 is attracted towards the first coil 206.
[0030] In an example, the protrusion 218 on the circular disc 216 and the cam member 214 may be magnetized such that they have opposite or same magnetic polarity. Due to the same or opposite magnetic polarity of the protrusion 218 and the cam member 214, the protrusion 218 is repelled or attracted uniformly by the walls of the grooves 226 hence avoiding contact and friction with along the walls of the grooves 226. Due to the absence of the friction, there is less wear and tear of the cam member 214 and the protrusion 218. Further in an example, the protrusion 218 may not be magnetized, however may be made up of a ferrous metal. In such cases, the cam member 214 may be magnetized and the uniform attraction force exerted on the protrusion 218 in the groove 226 may prevent friction of the protrusion along the

walls of the grooves 226. In the figure the protrusion 218 is shown in cylindrical shape, however, it should be noted that any shape of the protrusion may be possible. [0031] Figure 4a shows an exploded view of a food processor 402 as an example of the present subject matter. The food processor 402 comprises a container 404 having a blade assembly 406 at the bottom of the container 404. The food processor further comprises a first coil 408, similar to the first coil 206, and a second coil 410, similar to the second coil 208. Further, a longitudinal member 412, similar to the longitudinal member 204, is also shown between the first coil 408 and the second coil 410. The longitudinal member 412 is free to move between the first coil 408 and the second coil 410. The food processor further comprises a shaft coupler 414, similar to the shaft coupler 212, coupled with the longitudinal member 412. The food processor 402 further comprises a circular disc 416, similar to the circular disc 216. The circular disc 416 comprises a protrusion 418 and a driving shaft 420. The driving shaft is to protrude through the base of the container 404 and is to couple to the blade assembly 406. The food processor 402 further comprises a cam member 422 coupled to the longitudinal member 412 and encloses the protrusion 418. Enclosing the protrusion 418 effectively couples the circular disc 416 with the longitudinal member 412. In an example, the cam member 422 may comprise a groove to enclose the protrusion 418. Further, in an example, the first coil 408, the second coil 410, the longitudinal member 412, the shaft coupler 414, the cam member 422, the circular disc 416 may be housed in a housing 424 of a platform 426.
[0032] In an example, to operate the food processor 402, a user of the food processor 402 places the container 404 such that the blade assembly 406 of the container 404 is coupled with the driving shaft 420. After, the above step is performed, the container 404 may stand coupled on the platform 426 as shown in figure 4b.
[0033] In an example, a user may pour the material in the container 404 and may attach a lid to the container 404. In an example, the container 404 may comprise protrusions to snap fit the lid on the container 404. In an example, the lid may also comprise protrusions to couple to grooves on the container 404. After, the lid is

attached to the container 404, the food apparatus 402 is switched ON by pressing a switch 428-1 on the platform. The switching ON of the food processor 402 energize the first coil 408 and the second coil 410. The energization of the first coil 408 and the second coil 410 exerts a force on the longitudinal member 412 as explained with reference to 3a-3c. The exerted force on the longitudinal member 412 causes a to and fro (longitudinal motion) movement of the longitudinal member 412. As the shaft coupler 414 is coupled to the longitudinal member 412, the shaft coupler 414 also moves with the longitudinal member 412. The movement of the shaft coupler 414 causes movement of the cam member 422. The cam member 422 enclosing the protrusion 418 a circular motion of the circular disc 416. In an example, the protrusion 418 or a lining on the protrusion on the circular disc 416 and the cam member 422 or a lining on the cam member 422 may be magnetized such that they have same or opposite magnetic polarity. Due to the same or opposite magnetic polarity of the protrusion 418 and the cam member 422, the protrusion 418 is repelled or uniformly attracted by the walls of the grooves, hence avoiding contact and friction. Due to the absence of the friction, there is less wear and tear of the cam member 422 and the protrusion 418.
[0034] The circular motion of the circular disc 416 causes a rotation of the driving shaft 420. The rotation of the driving shaft 420 rotates the blade assembly 406 and thus, the material in the container 404 is grinded/mixed. Further, the user may control the speed of the rotation of the driving shaft 420 by the switches 428-2, 428-3, 428-4. Pressing of each of the switch 428-2, 428-3, 428-4 may alter the frequency of change of polarity of magnetic field by change in supply voltage or electric current in the first coil 408 and the second coil 410. Frequency of change of polarity of electric current may change the speed and direction of the longitudinal motion of the longitudinal member 412 and hence the speed of rotation of the driving shaft 420.
[0035] According to the present subject matter, when the mixing or grinding process is completed the food processor 402 is switched OFF using the switch 426-1. The user may thereafter remove the mixed or grinded material from the container 404.

[0036] Although implementations for rotating device are described, it is to be understood that the present subject matter is not necessarily limited to the specific features of the systems described herein. Rather, the specific features are disclosed as implementations for rotating device.

I/We Claim:
1. The rotating device (100) for rotating a blade-like element (102) of a food
processor, the rotating device (100) comprising:
a longitudinal member (104);
a circular disc (216) comprising a driving shaft (108) wherein the driving shaft (108) is to couple to the blade-like element (102) of the food processor; and
a motion conversion assembly (110) coupled to the longitudinal member (104) and the circular disc (106), the motion conversion assembly (110) comprises;
a shaft coupler (212) coupled with the longitudinal member (104) such that the shaft coupler (212) moves longitudinally with longitudinal member (104) during a longitudinal movement of the longitudinal member (104).
a cam member (214) coupled with the shaft coupler (212) such that the cam member (214) moves longitudinally along with the shaft coupler (212),
wherein the cam member (214) comprises a groove to accommodate a protrusion (218) of the circular disc (216) and the longitudinal movement of the cam member (214) causes the rotation of the circular disc; and
wherein the cam member (214) and the protrusion (218) is magnetic and the magnetic polarity of the cam member (214) is same or opposite to the magnetic polarity of the protrusion (218) on the circular disc (216).
2. The rotating device (100) as claimed in claim 1, wherein the rotating device (100) further comprises a first coil (206) and a second coil (208) that are electrically energized to enable the longitudinal movement of the longitudinal member (204).
3. The rotating device (100) as claimed in claim 1, wherein the longitudinal member (104) comprises magnetic material

4. The rotating device as claimed in claimed 1, wherein the protrusion (218) on the circular disc (216) is magnetic.
5. A food processor (402) comprising;
a container (404) having a blade assembly (406) at its base;
a first coil (408);
a second coil (410) placed at an axial distance from the first coil (408);
a longitudinal member (412) placed axially between the first coil (406) and the second coil (408) such that the longitudinal member (412) is to move longitudinally between the first coil (406) and the second coil (408);
a shaft coupler (414) coupled with the longitudinal member (412) such that the shaft coupler (414) moves with the longitudinal member (412);
a circular disc (416) having a protrusion (418) and a driving shaft (420) wherein the driving shaft (420) protrude through the base of the container (404) to couple to the blade assembly (406);
a cam member (422) coupled with the shaft coupler (414) such that the cam member (422) moves along with the shaft coupler (414) and the cam member (422) enclosing the protrusion (418) such that the movement of the cam member (422) rotates the circular disc (418); and
wherein the cam member (422) and the protrusion (418) is magnetic and the magnetic polarity of the cam member (422) is same or opposite to the magnetic polarity of the protrusion (418) on the circular disc (416).
6. The food processor (402) as claimed in claim 5 wherein the cam member (422) is magnetic and the magnetic polarity of the cam member (422) is same or opposite to the magnetic polarity of the projection on circular disc (416).
7. The food processor (402) as claimed in claim 5, wherein the cam member (422) comprises a groove to enclose the protrusion (418) of the circular disc (416).

8. The food processor (402) as claimed in claim 5, wherein the cam member (422) translates a longitudinal motion of the longitudinal member (412) into a circular motion of the circular disc (416).
9. The food processor (402) as claimed in claim 8, wherein the first coil (408) and the second coil (410) is electrical energized to enable longitudinal motion of the longitudinal member (412).
10. The food processor (402) as claimed in claim 5, wherein the longitudinal member (412) is permanently magnetized.