a pizza sauce dispensing system 10 , according to an embodiment of the invention , is shown generally in fig1 . system 10 includes base 11 , selectively rotatable disc 12 , dispensing arm 14 , which is selectively pivotable according to one embodiment , dispensing or spraying mechanism 15 with nozzle 16 and hose 17 , and controls 18 having display / keypad 20 . rotatable disc 12 is adapted to receive a pizza pan , with a pizza crust thereon . spraying mechanism 15 also includes a pumping system and sauce reservoir ( not shown ) for supplying pizza sauce to nozzle 16 . fig2 is a schematic illustration of pizza sauce dispensing system 10 . as shown in fig2 rotatable disc 12 includes tray 40 having an upper surface of nested , concentric rings 41 , center 42 and outer edge 44 with rim 46 . rotatable disc 12 further includes motor engagement member 48 . in association with disc 12 , base 11 of system 10 further includes motor 50 having receptacle 52 for receiving base engagement member 48 . motor 50 is in electrical and operative communication with controls 18 and programmable logic controller ( plc ) 54 . dispensing arm 14 further includes vertical support 60 , horizontal member 62 , first end 64 , second end 65 , and fasteners 68 . in association with arm 14 , base 11 of system 10 further includes motor 70 and sensor 72 , which are both in electrical and operative communication with controls 18 and plc 54 . as also shown in fig2 spraying mechanisim 15 further includes pump system 80 that supplies nozzle 16 with pizza sauce . pump system 80 includes reservoir 82 and pump 84 having optional drawback cylinder 86 . pump 84 is in electrical and operative communication with controls 18 and plc 54 . reservoir 82 is preferably refrigerated to lengthen the storage time of the pizza sauce . rotatable disc 12 is removably attached to motor 50 and supported on base 11 via engagement member 48 , which is removably inserted in receptacle 52 . motor 50 is preferably a stepper motor , or a motor known in the art for permitting selective clockwise or counterclockwise rotation of disc 12 relative to base 11 . motor 50 can operate independently ( e . g . as a direct drive motor for turntables ) or in association with other motors and / or belts and pulleys , as known in the art , for providing selective rotation of disc 12 . motor 50 receives commands from controls 18 and plc 54 to determine the activation , deactivation , acceleration , and deceleration of rotation of disc 12 , particularly in relationship to the operation of dispensing arm 14 and spraying mechanism 15 . dispensing arm 14 is pivotally mounted relative to base 11 , according to one embodiment . in particular , vertical support 60 is mounted to , and extends upwardly from , motor 70 of base 11 . motor 70 is preferably a stepper motor and is capable of causing rotation of vertical support 60 in either a clockwise or counterclockwise rotation . as with motor 50 , motor 72 also can be another type motor that operates independently ( e . g . a direct drive motor ) or in association with accompanying belts , pulleys , etc ., as known in the art , to achieve selective control over the activation , deactivation , acceleration , deceleration and the rate and direction of rotation of vertical support 60 . sensor 72 acts in cooperation with motor 70 and plc 54 to control the extent and direction of pivoting of vertical support 60 . horizontal member 62 of dispensing arm 14 is connected to vertical support 60 in a generally perpendicular relationship , so that horizontal member 62 extends over rotatable disc 12 . horizontal member 62 has a length ( e . g . up to about ten inches ) to ensure that first end 64 will be disposed over or adjacent to center 42 of tray 40 for the largest pizza ( e . g . with a sixteen inch diameter dough base ) that can be set in tray 40 of rotatable disc 12 . vertical support 60 has a length sufficient to ensure that horizontal member 62 is vertically spaced from rotatable disc 12 . horizontal member 62 also carries hose 17 along its length and fasteners 68 for securing hose 17 on member 62 from its first end 64 to second end 64 , and for securing nozzle 16 at second end 65 . nozzle 16 of spraying mechanism 15 receives sauce for spraying or otherwise dispensing onto the pizza dough base via hose 17 and pumping system 80 . pumping system 80 can comprise a commercially available condiment pumping system that includes a pump , regulator ( s ), air solenoid , and / or drawback cylinder , for example . reservoir 82 , which preferably holds a large volume of sauce , is operably coupled to pump 84 . drawback cylinder 86 is an optional component of system 80 and causes sauce to evacuate from nozzle 16 through hose 17 after pump 84 is deactivated to prevent dripping and clogging of sauce at nozzle 16 . other pumping systems known in the art that provide the functions described herein can be readily used . pump 84 is activated and deactivated selectively , and its flow rate controlled , by plc 54 and controls 18 . pumping system 80 also optionally includes a stepper motor that is incorporated into pump 84 , or operates in association with pump 84 , to facilitate control of a variable flow rate of sauce through hose 17 and nozzle 16 . for example , with this feature , it is believed the flow rate may be automatically decreased when less sauce is needed at a given location on the pizza crust ( e . g . center ) or increased when more sauce is needed at other locations on the pizza crust ( e . g . outer edge ). fig3 shows dispensing arm 14 of sauce dispensing system 10 in a storage mode , and illustrates the automatic pan - centering feature of system 10 . arm 14 is stationed adjacent to outer edge of disc 12 . a smaller size pan 110 with dough 111 thereon , such as a pan for a personal pan pizza , is placed concentrically relative to center 42 of nested rings 41 . each one of the rings 41 is sized with a predetermined diameter and generally has a circular shape , to accommodate a predetermined size and shape of a pan , such as pan 110 . since rings 41 are concentrically arranged , once pan 110 is set within its matching diameter - sized ring 41 , pan 110 is automatically centered on rotatable disc 12 . fig4 shows sauce dispensing system 10 just prior to use , according to one embodiment . in this example , a larger size pan 120 with dough 122 is set on rotatable disc 12 , in one of the rings 41 that matches the diameter of pan 120 . pan 120 is automatically centered , as described above , by the concentricity of rings 41 . using controls 18 , a saucing operation is started . in particular , the diameter size of pan 120 , type and volume of sauce , and type of dough is identified at controls 18 ( as well as other parameters ). optimally , this identification at controls 18 occurs by pressing a single key on keypad 20 or via bar code scanning , as will be further described . this information is entered into , or recalled from memory , in plc 54 . plc 54 then identifies several parameters regarding the saucing operation for that identified pizza , including a starting location adjacent the outer edge on the dough and an ending location adjacent the center of the dough . additional parameters of the pre - programmed operation can include : ( 1 ) the total time , rate , and / or direction that disc 12 rotates throughout the operation ; ( 2 ) the total time , rate , and / or direction ( counterclockwise or clockwise ) that arm 14 pivots over disc 12 ; and ( 3 ) the total time , rate , and time of initiation and termination of sauce flowing through nozzle 16 of spraying mechanism 15 . plc 54 is programmed for these parameters using well known principles of kinematics for a rotating disc , pivoting arm , and vertically dropping liquid , for example including the use of the following equations : w = 2 πn / 60 = 0 . 10472 n ( in rad / sec ), where n = rpm , and ( 1 ) t = 2π / ω , where t is equal to the time required to complete one full cycle . ( 2 ) using the pressure of the sauce spraying mechanism 15 , the volume of sauce to be sprayed , the desired sauce pattern on the pizza , and the above equations and familiar kinematic principles , a program for activation , deactivation , and rate control of rotatable disc 12 , pivotable arm 14 , and spraying mechanism 15 is stored in plc 54 for later activation . ideally , each program for a given pizza results in the time to complete one cycle , including the time to sauce a pizza , being less than nine seconds . after this information is registered in plc 54 for saucing the dough on pan 120 , operation begins with arm 12 pivoting so that nozzle 16 is located at a predetermined site above dough 122 adjacent an outer edge 131 of dough 122 ( e . g ., one - quarter inch from an outer edge of the pizza ). in a single step , according to one embodiment , disc 12 begins rotating as arm 12 pivots inward and sauce sprays out of nozzle 16 onto dough 122 . fig5 schematically illustrates the interaction of disc 12 and arm 14 as sauce 17 is deposited on dough 122 ( resting on tray 40 of rotatable disc 12 ). while sauce is being deposited on dough 122 , disc 12 rotates in a counterclockwise direction ( identified by directional arrow a ) and arm 14 pivots in a counterclockwise direction ( directional arrow b ) from an outer position 130 ( identified by phantom lines ) adjacent outer edge 131 of dough 122 to a center position 132 adjacent center 42 of disc 12 and / or dough 122 . if desired , sauce 17 also can be deposited when arm 14 pivots from its center position 132 to outer position 130 . this return movement is identified by directional arrow c . as seen in e . g . fig5 this operation results in sauce 17 forming a spiral pattern 133 on dough 122 . as described above , plc 54 is programmed so that an exact start location and an ending location of arm 14 , as well as other identified parameters , during the saucing operation are used for each differently sized pizza , type of pizza and type of sauce . for example , a twelve - inch pan pizza might require about 4 . 25 ounces of sauce to be deposited over a dough having a surface area diameter of about 10 . 5 inches . in addition , the pan pizza might require that saucing start about one - quarter inch from outer edge 131 of the dough 122 and use sauce type “ a .” using this criteria and accounting for the speed of rotation of any given point on disc 12 using well known principles of kinematics , the preprogrammed plc 54 initiates and variably maintains the spraying rate of nozzle 16 ( by controlling the rate and / or activation and deactivation of pump 84 ), the rate of rotation of disc 12 and the rate of pivoting and direction of arm 14 . in another example , such as for a different brand pizza , plc 54 would be preprogrammed to start saucing at about three - quarters of an inch from outer edge 131 of the dough 122 , and / or use sauce type “ b .” finally , in another example , for thin pizza , plc 54 would be preprogrammed to start saucing at the lip of dough 122 , with one or more of sauce types “ a ” and “ b ”, and / or additional sauce types . of course , for each of the types of pizza , the starting location is achieved by pivoting arm 14 . by using sensor 72 at vertical support 60 of dispensing arm 14 , plc 54 determines the position of arm 14 relative to outer edge of disc 12 and / or relative to center 42 of the tray 40 . as shown in fig6 and using the above - described method with sauce dispensing system 10 , sauce 17 is distributed evenly over the surface of dough 122 in the exact volume required and without manually handling the sauce or manually spreading the sauce on the dough . this technique is fast and prevents damage to dough since no mechanical force presses downwardly against dough 122 . fig7 shows an optional second spraying mechanism 90 having reservoir 91 , pump 92 , hose 94 , and nozzle 96 . second spraying mechanism 90 is in electrical and / or operative communication with controls 18 , including plc 54 . having second spraying mechanism 90 , in addition to spraying mechanism 15 , allows system 10 to instantaneously apply different types of sauces without changing nozzle 16 , pump 84 or reservoir 82 of pump system 80 . plc 54 is programmed to selectively activate one or both of pump system 90 and pump system 80 to achieve the desired saucing . as seen in fig7 spraying mechanisms 15 and 90 , particularly nozzle 16 and 96 are arranged side by side on dispensing arm 14 . of course , more than two spraying mechanisms can be used . for example , if a third or fourth type of sauce is available , a third and fourth spraying mechanism , or portions thereof ( e . g . a nozzle or reservoir ), can be operably connected to controls 18 and plc 54 for selectively operating the extra spraying mechanisms . moreover , if desired , two types of sauces can be applied to a dough base simultaneously or in succession , again without changing hardware or other features of the system . fig8 shows , in greater detail , the nested concentrically arranged rings 41 of tray 40 according to one embodiment . in particular , disc 12 includes optional lower base 141 and removable upper tray 142 . tray 142 includes rim 144 , center 146 , and large - sized diameter ring 152 , medium - sized diameter ring 154 , and small - sized diameter ring 156 . tray 142 preferably has an overall height h 1 of about two and one - half inches to maintain a space saving low profile . each ring 41 of tray 142 ( e . g ., ring 154 ) has a height h 2 ( which may be the same as or different than other rings 41 ) to act as a border to contain the pizza pan that matches the diameter of that ring . height h 2 is preferably 0 . 125 inches , according to one embodiment , to allow the entire tray 142 to have a low profile . of course , a wide variety of dimensions are contemplated according to the invention , for this and other features described herein . tray 142 optionally is formed integrally with lower base 141 . tray 142 , with or without base 141 , is preferably removable from base 11 of system 10 to permit easy washing and maintenance of tray 142 . of course , tray 142 can be formed with any number of rings 41 ( more or less than rings 152 , 154 , 156 ), with each ring 41 having a predetermined diameter that matches the diameter of an available pizza pan . tray 142 is preferably made from a plastic material for easy and inexpensive manufacture , lightweight handling , and convenient washing , although other materials will be apparent for use , of course . fig9 shows pizza sauce dispensing system 200 , according to an alternate embodiment of the invention . system 200 uses rotatable disc 12 and includes stationary arm 201 , inner multi - port nozzle 202 , intermediate multi - port nozzle 204 , and outer multi - port nozzle 206 . each nozzle 202 , 204 , 206 has its own hose 208 and solenoid 210 . of course , system 200 further includes controls 18 with plc 54 and sauce pumping system 215 with reservoir 216 ( similar to pump system 80 ) or other pumping systems known in the art . sauce pumping system 215 is in fluid communication with each hose 208 to supply sauce to nozzles 202 , 204 , and 206 . in addition , as previously described for sauce dispensing system 10 , controls 18 with plc 54 coordinate the rotation of disc 12 , and activation / deactivation and spray rate of nozzles 202 , 204 , 206 to achieve the selected amount of sauce deposited at the selected thickness and spacing on the pizza crust . in use , arm 201 is stationary while sauce is sprayed from nozzles 202 , 204 , and 206 as rotatable disc 12 rotates underneath arm 201 . for pizzas having smaller diameters , only inner multi - port nozzle 202 is activated to spray sauce on disc 12 while disc 12 rotates through a single revolution . for pizzas with intermediate size diameters , both inner multi - port nozzle 202 and intermediate multi - port 204 are activated to spray sauce on disc 12 while disc 12 rotates through a single revolution . finally , for pizzas with larger diameters , all three of the inner , intermediate and outer multi - port nozzles 202 , 204 , 206 are activated to spray sauce on disc 12 while disc 12 rotates through a single revolution . of course , multiple revolutions instead of single revolutions are also contemplated according to the invention . fig1 also schematically illustrates a sauce dispensing system 220 , according to an alternate embodiment of the invention . system 200 includes stationary bracket 221 , slidable member 222 , nozzle 224 , and rotatable disc 226 . nozzle 224 of system 220 is supplied with sauce from a pump and reservoir system ( not shown ) substantially similar to pumping system 80 as previously described in connection with fig2 . in this example , sauce is sprayed from nozzle 224 onto rotating disc 226 ( with dough thereon ), while slidable member 222 selectively slides along bracket 221 from an outer edge of disc 226 to a center of disc 226 , and / or conversely from a center of disc 226 to its outer edge . this arrangement also causes sauce to be deposited in a spiral pattern onto dough on disc 226 , if desired . in addition , as previously described for sauce dispensing system 10 , controls 18 with plc 54 coordinate the rotation of disc 226 , sliding of member 222 , and activation / deactivation and spray rate of nozzle 224 to achieve the selected amount of sauce deposited at the selected thickness and spacing on the pizza crust . finally , controls 18 , previously shown in fig2 are further illustrated according to one embodiment in fig1 . controls 18 include display 250 , manual start 252 , stop 254 , reset 256 , power 258 , operation light 260 , and program selection arrows 262 . controls 18 also include a communications port 264 ( such as a rs232 or other known communication mode , e . g . ethernet ), and associated programming in plc 54 for receiving and operating with optional bar code scanner 270 . finally , a membrane - type keypad 280 permits saucing a pizza by identifying a type of pizza sauce and size of pizza with the touch of a single button . to operate system sauce dispensing system 10 using optional bar code scanner 270 , a pizza dough to be sauced will carry a unique bar code ticket that identifies parameters such as a predetermined diameter , sauce type and dough type , or more simply that identifies a preprogrammed saucing operation for that type of pizza . an operator scans the bar code ticket using bar code scanner 270 , thereby registering the selected parameters with the plc , or identifying the preprogrammed saucing operation within plc 54 . updates or changes to programs for running saucing operations can be obtained online , e . g . through the internet , according to one embodiment , and then downloaded into plc 54 . of course , such updates or changes also can be supplied by disk , telephone modem or other known data - transfer devices and methods . updates can include refinements in coordinating disc rotation and arm pivoting , and / or can include supplying a new set of parameters for applying sauce for a new size or type of pizza and / or type of sauce . the programmable logic controller ( plc ) 54 also permits counting the number of pizzas sauced and to be sauced , as well as recording their types , for coordination with e . g . cleaning or maintenance requirements for the system , reservoir replenishment , etc . since this information can be displayed on display 250 , these features greatly facilitate the preparation of a large number of pizzas having different characteristics . pizza sauce dispensing systems according to embodiments of the invention provide many advantageous features . first , such systems allow a precisely controlled amount of sauce to be deposited on a pizza dough , in a predetermined pattern , without manually handling the sauce during application and without manual spreading . second , by using multiple pumping systems , embodiments of the invention permit at least two different sauces to be applied without requiring a change in a dispensing head , pump , or reservoir . third , the programmable logic controller permits customization of sauce operations that are not practical with factory - type sauce dispensers , to permit saucing a high volume of pizzas while still accommodating different sized pizzas and different sauces . finally , the sauce dispensing system saves space by allowing several types of pizza to be rapidly made in the space of a single pizza make table . other advantages will be apparent to those of ordinary skill upon reading this disclosure . while the invention has been described with reference to specific embodiments , the description is illustrative and is not to be construed as limiting the scope of the invention . for example , although embodiments of the invention have been described with respect to pizza , pizza sauce , pizza pans and pizza toppings , the invention is applicable to the preparation of other food items as well . similarly , references to dough and dough bases should be interpreted to include other edible and inedible platforms for receiving food substances or other substances in the manner disclosed and contemplated herein . other devices and methods according to the invention will be apparent to those of ordinary skill without departing from the spirit and scope of the invention .
a pizza sauce dispenser simultaneously dispenses and spreads a precisely controlled amount of sauce onto a pizza dough base without manually handling the sauce or the dough during operation . the dispenser includes a selectively rotatable disc and an arm that selectively extends over the disc . at lease one nozzle is supported by the arm and selectively dispenses the sauce onto the dough . a control mechanism controls : a selected rate and direction of disc rotation ; a selected pivot rate and direction of the arm ; and / or a selected rate of dispensing sauce through the nozzle . in use , with pizza dough placed on the disc , the disc is rotated and the arm pivoted over the dough so that the nozzle traverses a path from the outside edge of the dough to the center of the dough or vice versa . sauce thus is deposited in a spiral or other desirable pattern .