Single-grinding body grinding device in particular for grinding either one or more coffee blends

Abstract: A coffee grinding device (1) comprises a coffee loading hopper (2) and two coffee metering assemblies (3), each of which is provided with a coffee metering chamber (10) defined by an outlet tilting wall (15), a movable top wall (13), separating a coffee holder (14), and a coffee metering wall (17) which can be adjustably driven for selecting a coffee dose and which is movable with respect to the outlet wall (15) for ejecting toward the loading hopper (2) the coffee set dose.

Description: BACKGROUND OF THE INVENTION The present invention relates to a coffee grinding device for coffee making machines of the type using two or more coffee blends. As is known, for preparing coffee infusions starting from two different coffee blends there are generally used automatic coffee making machines which comprise several coffee grinding devices, each of which is provided and set for grinding a given coffee blend. Also known is the fact that different coffee blends require a different grinding degree and that a mixture of the coffee blends does not usually result in a satisfactory coffee infusion. Moreover the coffee, even if it is in grain form, must be properly protected from moist environments. The document US-A-2 827 845, which represents the most pertinent background art, discloses a restaurant coffee making machine including a simple grinding body coffee grinding device comprising a coffee grinding assembly including a coffee loading hopper adapted to hold a set amount of coffee grains therein. SUMMARY OF THE INVENTION Thus, the main object of the present invention is to overcome the above mentioned drawbacks, by assuring the possibility of using different coffee blends, each of which has the coffee particle size adapted to provide a very good coffee infusion, as well as by preventing ground coffee residues from altering a subsequent coffee dose including a different coffee blend or having a different particle size, and this by the use of a single coffee grinding device. Another object of the present invention is to provide such a coffee grinding device which is so designed and arranged as to prevent the coffee grains from being heated upon grinding, so as to preserve the main physical and chemical properties of the ground coffee. Yet another object of the present invention is to provide a coffee grinding device which can be made starting from easily available elements and materials. According to one aspect of the present invention, the above mentioned objects, as well as yet other objects, which will become more apparent hereinafter, are achieved by a coffee grain grinding device for grinding either one or more coffee blends, defined in the accompanying Claim 1. BRIEF DESCRIPTION OF THE DRAWINGS Further characteristics and advantages of the present invention will become more apparent from the following detailed description of a preferred embodiment thereof, which is illustrated, by way of an indicative but not limitative example, in the following disclosure with reference to the accompanying schematic drawings, where: FIGURE 1 is an elevation partially cross-sectioned view of the grinding device according to the present invention, and FIGURE 2 is a cross-sectional view of the coffee grinding assembly included in the grinding device according to the invention. DESCRIPTION OF THE PREFERRED EMBODIMENT With reference to the figures of the accompanying drawings,the coffee dose volume adjusting grinding device for coffee making machines according to the present invention comprises a coffee grinding assembly, indicated overally at the reference number 1,which will be disclosed in a more detailed way hereinafter. The coffee grinding assembly 1 is provided,at the top thereof,with a loading hopper 2 which is arranged under at least two coffee supplying or metering assemblies,each being indicated at 3 . Each coffee metering assembly 3 comprises a coffee metering chamber 10,defined by a bottom wall 11 which merges with an unloading chute 12,in turn converging onto the loading hopper 2. The coffee metering chamber 10 is moreover defined by a top movable wall 13,which can be driven with a guillotine like movement,and operating as a separating element for a coffee holder 14,into which a grain coffee blend is introduced. At the chute side,the metering chamber 10 is delimited by an outlet wall 15,pivoted at 16 at the top end portion thereof,and which can be tilted in order to allow the coffee powder to be ejected toward the loading hopper 2,as it will be disclosed in a more detailed way hereinafter. The coffee metering chamber 10 is moreover delimited by a metering wall,indicated at the reference number 17,which wall can be differently arranged with respect to the tilting wall 15,so as to adjust the metering volume of the metering chamber 10 and,accordingly,the required coffee dose. In operation,after having adjusted the metering wall 17 to a set position,the top movable wall 13 is opened so as to allow coffee grains to be introduced into the metering chamber 10. In this connection it should be apparent that the coffee amount to be introduced into the metering chamber 10 will depend on the volume of said chamber,that is on the position of the wall 17. After having introduced the coffee grains,the wall 13 is returned to its closing position and the metering wall 17 is driven so as to outward eject the set coffee dose,by causing the wall 15 to be tilted to an open condition to allow the coffee grains to freely fall into the coffee loading hopper 2. As stated,there are provided at least two coffee metering assemblies,thereby it will be possible to load into the single assemblies respective coffee blends of different characteristics,depending on the coffee infusion to be prepared. The grinding assembly 1 is provided,under the loading hopper 2,with a fixed grinding member 20,made rigid with said hopper and which overlies a movable coffee grinding member 21,coupled to a plate 22 mounted on a shaft 23 which is coupled, through bearings indicated at 24, by a fixed structure 25. On the shaft 23 there is also supported a toothed pulley 26 which is driven,through a toothed belt 28,by first turning driving means. In order to adjust the coffee grinding fineness, the fixed coffee grinding member 20 is coupled to a hopper bearing body 30 which is associated with said fixed structure 25 through a threaded portion 31 allowing the distance of the fixed coffee grinding member from the movable coffee grinding member to be properly adjusted. In order to perform this spacing adjustment, there are provided second driving means 40 which drive a small pignon 41 meshing with a toothed gear wheel 42, in turn keyed on the hopper bearing body 30. Thus,by actuating said second driving means 40 the grinding fineness can be adjusted in a very accurate way,in order to provide the proper coffe particle size for each set coffee blend. To the foregoing it is to be added that,in order to operate with a reduced driving power,the first driving means,provided for turning the movable coffee grinding member,are operated before the introduction of the coffee grains,so as to overcome any starting inertial effects,thereby also reducing possible heating effects on the coffee grains being ground. Moreover the rotary movement is held for a set period of time from the introduction of the coffee powder,thereby providing a proper cleaning of the active grinding region of the coffee grinding members,so that all of the ground coffee will be ejected to the coffee outlet,where is provided an automatic coffee infusion making assembly,indicated overally at the reference number 50. Thus,owing to the above disclosed provisions, the grinding device operating power can be held at a very reduced value,while preserving the characteristics of the coffee grains being ground. From the above disclosure it should be apparent that the invention fully achieves the intended objects.

Claims: A coffee grain grinding device, for grinding either one or more coffee grain blends, comprising a single coffee grain grinding assembly (1) including a coffee grain loading hopper (2) adapted to hold a set amount of coffee grains therein, wherein said device further comprises, above said loading hopper (2), at least two coffee grain supply assemblies (3) provided for holding respectively different types of coffee grains and for supplying said coffee grains in metered amounts into said coffee grain loading hopper (2), each said coffee grain supply assemblies (3) having a coffee grain metering chamber (10) defined by an outlet tilting wall (15), a movable top wall (13) separating a coffee grain holding vessel (14) and a coffee grain metering wall (17) which can be driven, for providing a set grain coffee dose, with respect to said outlet wall (15) so as to eject into said hopper a set grain coffee dose from each said coffee grain supply assemblies (3) to be supplied for grinding to said single coffee grain grinding assembly (1). A grinding device according to Claim 1, wherein said top movable wall (13) is adapted to be driven with a guillotine type of movement to allow said coffee grains to be selectively introduced into said metering chamber (10). A grinding device according to Claim 1, wherein said coffee metering wall (17) can be driven toward said tilting wall (15) so as to tilt said tilting wall to an opening position thereof as said coffee grains are loaded into said hopper (2). A grinding device according to Claim 1, wherein said coffee grinding assembly (1) comprises a coffee grinding fixed member (20) rigid with said hopper (2) and facing a coffee grinding movable member (21) coupled to a plate (22) keyed on a shaft (23), said shaft being driven by first driving means. A grinding device according to Claim 4, wherein said fixed grinding member (20) is coupled to spacing adjusting means (31) adapted to adjust a spacing of said fixed and movable grinding members, (20, 21) said spacing adjusting means comprising a coupling threaded portion (31) coupling a hopper bearing body (30) and a fixed structure (25), said hopper bearing body (30) being provided with a gear wheel (42) meshing with a pinion (41) driven by second driving means (40). A grinding device according to Claim 1, wherein said grinding device further comprises means for turning said movable grinding member (20) before the introduction of said coffee grains in order to reduce inertia effects of said movable grinding member (20).

Inventors: LOCATI SANTINO C O CIMBALI S P, LOCATI, SANTINO, LOCATI, SANTINO, C/O CIMBALI S.P.A.
Applicants: CIMBALI SPA, CIMBALI S.P.A.
Application year: 1990
Main classification: A47J31
IPC codes: A47J42, A47J31