fig1 is a perspective view of a conveyorized oven 10 according to the preferred embodiment of the present invention . while the device shows that pizza pies 11 are the food product to be cooked , it should be clearly understood that oven 10 has a wide variety of applications . the illustration with pizza is for purposes of illustration rather than limitation . oven 10 comprises three main components : an oven housing 12 , a pair of conveyors 14 and 15 , and a control panel 16 . housing 12 includes a generally square top 18 , side walls 19 and 20 , and generally rectangular front and back walls 21 and 22 , the latter each having a pair of aligned openings 24 for receiving the conveyors 14 and 15 . the openings define the ends of an elongate heating tunnel 25 which extends through cabinet 12 . by reference to fig3 and 4 , it will be appreciated that the various walls of oven 10 are insulated by insulation 26 to prevent heat loss . housing 12 is supported on a metal framework 30 and casters 31 are provided to facilitate movement of oven 10 . in the preferred embodiment , oven 10 is constructed so that the top 18 is at a convenient height so that it may be employed as a work surface . oven 10 , therefore , serves a dual function and reduces the overall space requirements for any facility employing oven 10 . the conveyors 14 and 15 will be described in greater detail later in this specification , but at this point it should be understood that oven 10 includes two spaced apart and parallel conveyor lines and that the lines extend beyond the front and back walls 21 and 22 of housing 12 . while the length of the extension is not critical to the present invention , it is convenient to have enough extra length to permit food products to be loaded onto the conveyors and removed therefrom . it may , in some instances , also be desirable to have an extra length on the exit end to allow accumulation of cooked food products . each of conveyors 14 and 15 include a pair of side support beams 34 having a plurality of conveyor rollers 35 supported therebetween . beams 34 are hollow and contain the gear , chain , and bearing systems to be described later herein . conveyors 14 and 15 also each include a tray 37 disposed beneath the rollers 35 and resting upon the floor of the oven housing 12 . fig1 shows one of such trays being partially opened and it will be appreciated that the trays are provided to catch crumbs or spills and that they are removable to facilitate cleaning of the oven . the two conveyors also each include a conveyor drive motor 39 mounted at the front end and on the outside corner of the conveyors . such motors are employed for driving the rollers 35 . the control panel 16 shown in fig1 is mounted beneath the housing 12 and includes the various switch and control devices for carrying out operation of oven 10 . the electrical system will be described more fully in a later section of this specification . dealing next with fig2 an alternate embodiment 40 of the present invention is shown . oven 40 differs from oven 10 in having only a single conveyor 41 . the overall shape of cabinet 42 is also different , the top being rectangular in configuration . another feature of the present invention which is apparent in fig2 and is applicable to both embodiments is that the conveyor assembly is slidably and removably received within the oven cabinets . this feature permits the conveyor to be shipped separate and apart from the cabinets and facilitates cleaning of the oven as well as repair and maintenance of the electrical and drive components for the rollers and heating elements . by reference to fig1 and 2 , it can also be seen that a drive gear housing 43 is provided to contain the coupling between the drive motors 39 and the internal components within support beams 34 . the housing also serves as a stop to ensure that when the conveyor assemblies are inserted into the ovens , they will be located at the proper location . the choice of whether to use a single or double conveyor oven or an oven with three or even more conveyors will in large measure depend on the product demand of the facility which employs the ovens . a primary advantage of systems having more than one conveyor is that only a single set of conveyors need be utilized during periods of reduced demand while additional sets would be available during periods of peak demand . another advantage of the multi - conveyor system is that different products can be cooked on the various conveyors since the temperature of the bottom heating elements can be separately adjusted . this system may be particularly applicable for different types of pizza for example where different ingredients and / or different types of crusts are employed . some products can be properly cooked with a lower bottom heat than others . primarily though the advantage of the multi - conveyor systems is that one or more entire conveyor assemblies may be turned off during periods of slack demand with the consequent savings in energy . referring next to fig3 and 4 , rollers 35 are live rollers driven by motors 39 . a sprocket 48 is coupled to the motor shaft which in turn is coupled by a first chain 49 to another sprocket 50 at one end of the support beam 34 . a second chain then connects sprocket 50 and the remaining roller sprockets 53 to drive same . only a few of the sprockets 53 are shown in fig3 to simplify the drawings for clarity of explanation . as will be appreciated by reference to the wiring diagram in fig1 , both the speed and the direction of the conveyors can be varied through appropriate electronic control . disposed between those rollers 35 which normally lie within the housings 12 and 42 are electrical elements 55 which preferably are of the resistance bar type . the invention is not to be limited to such types of heating elements as other types of gas or electric heaters may be employed . it can also be seen from fig3 and 4 that two such elements 55 are provided between each of the first three sets of rollers which lie within housings 12 and 42 , while only a single element 55 is provided between the live rollers in the central portion of the oven . these additional elements are provided at the ends of the oven to compensate for the cooling effect at the openings to the exterior of the oven and to rapidly heat food pans or the like used to contain food products . in lieu of multiple elements , higher wattage elements could be provided for the same purpose . the electrical connections for the various heating elements will not be described in detail , but a representative wiring diagram therefore is shown in fig1 . proceeding next to a description of the air heating features of oven 10 , it will be noticed in fig5 - 7 that an electrical motor 60 is disposed beneath cabinet 12 and is coupled to a blower 62 which may be of the squirrel - cage or any other suitable type . the outlet of the blower is coupled to a first duct 63 located below cabinet 12 which in turn is coupled to a pair of vertical ducts 64 which extend toward the top of cabinet 12 between the conveyor lines 14 and 15 . ducts 64 are generally in the center portion of cabinet 12 , but in a spaced apart relationship . ducts 64 in turn are coupled to a pair of generally u - shaped plenums 65 adjacent the roof of heating tunnel 25 with the legs of the u oriented generally toward the entrance and exit of the oven respectively . air outlets 66 and 67 are located adjacent the end of each of the u - legs and above the two conveyor lines . outlets 66 and 67 are in the form of slots with outlets 66 located just interiorly of outlets 67 . in the illustrated embodiment , outlets 66 are shorter in length than outlets 67 , but this feature is not critical to the present invention . by reference to fig3 it will be noticed that the slot outlets are located inside the front and back walls 21 and 22 by several roller pairs . by reference to fig9 the preferred form for outlets 66 and 67 is shown in detailed cross section . while only a single outlet is shown , the principles are applicable to both . it will be noticed from this figure that the outlet is slanted generally toward the center of the heating tunnel 25 . a first edge 68 of the outlet is formed by a downwardly extending flange of the sheet metal or other material used to construct the u - shaped plenum . the other half of the slot is formed by an elongate member 69 having two legs and an obtuse angle therebetween . the member 69 is secured to plenum 65 by a locking assembly 70 which permits the downwardly extended edge of member 70 to be moved toward and away from flange 68 . in this way , the adjustment of the width of the slots may be conveniently made . with reference to the air distribution system , it will be obvious that when using only a single conveyor line , the u - shaped plenum 65 would be eliminated in favor of an elongate duct extending between the front and rear of oven 40 with a pair of air outlets located at the ends of the duct to provide heating air above food products conveyed on assembly 41 . the same slot width adjustment means would be provided as used in the double conveyor system . the air return system also includes a plenum 74 located at the center of oven 10 and extending between the side walls 19 and 20 . plenum 74 is also generally rectangular in cross section and includes a pair of air inlet slots 76 located above the conveyor rollers and heating elements . a vertical duct 77 is coupled to plenum 74 at the interior of cabinet 12 and intermediate the conveyor lines , duct 77 extending downwardly toward blower 62 . air inlets 76 may also include the adjustment means such as those illustrated in fig8 . in fig8 the adjustment means include slidable and elongate angle members 79 coupled to plenum 74 with locking members 81 . the downwardly depending flanges may be moved toward or away from one another to set the openings at the desired distance . movement of angle members 79 is illustrated in dotted line in fig8 . duct 77 terminates below the floor of cabinet 12 in a housing 83 which in turn has an outlet coupled to an airflow housing 85 located on the opposite side of the blower 62 from motor 60 . a plurality of resistance type heating elements 87 are mounted within housing 85 and serve to heat the air flowing therethrough . the outlet of housing 85 is coupled to another chamber 88 located at the inlet side of blower 62 . the principles of this air return system are also applicable to a single conveyor line with only a single inlet 76 being required . now that the components of the airflow system have been desired , it will be appreciated that air is forced through outlets 66 and 67 in a downward direction onto food products being carried by rollers 35 . the air is also forced inwardly towards the center of cabinet 12 thereby avoiding air spillage and loss of heat from within oven 10 . the flow of air towards the middle of the oven is insured by the air inlets to duct 76 located at the center of the oven . now that the overall configuration of ovens 10 and 40 have been described , the operation thereof will be described with particular reference to oven 10 . the oven is assembled by inserting conveyors 14 and 15 into the openings 24 provided in the oven . the necessary electrical connections are then made . food products are placed on rollers 45 and passed into cabinet 12 at a speed which is set on panel 16 . the heating elements 55 are energized and set at the correct temperature for the particular food product . likewise , the heating elements 87 and the motor 60 are energized , each at the correct speed and temperature to ensure a proper flow of air through the airflow system for the particular products to be cooked . the inlets and outlets are also adjusted to ensure precise control of the cooking parameters . the food is cooked from the top and the bottom as it passes through cabinet 12 and exits onto the conveyor rollers 35 at the exit end of the oven . as has previously been indicated , the conveyor motors for the conveyor assembly 14 and 15 may be operated independently as are the elements 55 disposed in the respective conveyor lines . different products may be cooked on the respective conveyor lines . fig1 is a wiring diagram for oven 10 and includes standard electronic nomenclature . it will be apparent that other wiring procedures may be employed by one skilled in the art after reading the foregoing specifications . while the present invention has been illustrated by reference to two preferred embodiments , it is not to be limited thereby , but is to be limited solely by the claims which follow .
a conveyorized , electrically heated oven provides controlled top and bottom heating for pizza or other food products . cooking is accomplished in two ways . the top of the food is cooked with heated air circulated within the oven , while the bottom of the food is heated by electric heating elements located between live conveyor rolls . heated air within the oven is recirculated . in the preferred embodiment of the invention , two parallel conveyor lines are provided , with controls to permit use of one or both lines . because of the heat recirculation system , the oven does not require a heat vent and energy consumption is reduced .