Abstract:
A luminous character enclosing machine has an upper supporting plate ( 2 ) and a lower supporting plate ( 3 ) which are installed on a machine frame ( 1 ). A plate inlet and a plate outlet are formed respectively on two ends of the upper and lower supporting plates. A feeding unit, a grooving unit, an arc-curving unit, and a plate-clamping unit arranged between the two supporting plates are provided in succession from the plate inlet to the plate outlet. A grooving driving device is installed on the machine frame, and drives the grooving device to move up and down. This kind of grooving mode is a cold processing mode, heat generation during working which makes color of the stainless steel plates change is avoided, and a phenomenon of knife broken due to high speed rotation of a saw blade and the hardness of the stainless steel is prevented. The machine is simple in structure and convenient to operate.

Description:
FIELD OF THE INVENTION 
     The invention relates to the technical field of plate bending, in particular to a full-automatic luminous character enclosing machine used for enclosing edge of a stereoscopic luminous character. 
     BACKGROUND OF THE INVENTION 
     In recent years, stereoscopic luminous characters become the first choice for billboards because of their attractive and high-grade appearances and low cost. The edge of a stereoscopic luminous character is usually made to form a grooved character with an aluminum alloy sheet and a stainless steel sheet, and the intermediate part is filled by an LED luminous board or a common plastic sheet. The main work of making a stereoscopic luminous character edge is edge enclosure which mainly includes edge bending and arc curving. Traditional edge bending and arc curving are manual processes or using a cutting blade to carry out grooving followed by machining, thereby costing time and labor and having ugly appearance. Using a stainless steel sheet to make a grooved character requires high-pressure water jet to make a hollow-out character, and the high-pressure water jet has the power usually over 10 KW and is not so fast in cutting speed, therefore its cost is high and energy consumption is large. After the hollow-out character is made by cutting, an edge band needs to be welded to form a character shell. Edge band welding costs time and labor and has heat emission. Some advertisement companies use very thick stainless steel for making a hollow-out character to show their high-grade produces, and it costs long cutting time and high energy consumption. In order to provide a special device, the applicant has disclosed a stereoscopic luminous character enclosing machine (patent No.: 200710113527.5), which includes a feeding unit mounted on a main board of a machine body, a groove-cutting unit and an arc-curving unit, wherein the groove-cutting unit includes a traversing rack and an elevating rack mounted on the traversing rack, the traversing hack and the elevating rack are respectively driven by a motor through a ball screw, a motor-driven saw disc is mounted on the elevating rack, an arc-curving pressure roller elevating unit is mounted on the traversing rack, and an arc-curving pressure roller capable of passing through the main board of the machine body is disposed on the upper end of the arc-curving pressure roller elevating unit. This luminous character enclosing machine has the disadvantages as follows: first, heat is easily generated during cutting due to use of the saw disc for grooving, resulting in discoloration of a stainless steel band, and thus the machine is not suitable for groove-cutting of a stainless steel band; second, when a luminous character edge is completed, manual breaking is needed, which is unfavorable for automatic operation of the whole machine. 
     SUMMARY OF THE INVENTION 
     The object of the invention is to provide a luminous character enclosing machine suitable for making a stainless steel luminous character edge. 
     In order to realize the object, the provided luminous character enclosing machine includes an upper supporting plate and a lower supporting plate which are installed on a machine frame, and a plate inlet and a plate outlet are formed respectively on two ends of the upper and lower supporting plates. A feeding unit and an arc-curving unit are arranged in succession from the plate inlet to the plate outlet. The machine is structurally characterized in that a grooving unit and a plate-clamping unit mounted between the upper supporting plate and the lower supporting plate are disposed between the feeding unit and the arc-curving unit, and in addition, a grooving driving device for driving the grooving unit to move is mounted on the machine frame. 
     With the above structure, because the grooving unit and the plate-clamping unit arranged between the upper supporting plate and the lower supporting plate are disposed between the feeding unit and the arc-curving unit, and the machine frame is further provided with the grooving driving device for driving the grooving device to move and can control the grooving driving device to drive the grooving unit to move up and down, the grooving unit can groove a plate when doing up-down movement. Since such grooving mode is cold processing mode, it can neither cause discoloration of the stainless steel plate due to heat generation, nor result in knife broken due to high speed rotation of a saw blade and the hardness of the stainless steel. The invention is simple in structure and convenient to operate and especially suitable for grooving of a stainless steel character edge. 
     The grooving unit includes a vertical plate fixedly mounted between the upper supporting plate and the lower supporting plate, the vertical plate is connected to a tool holder which is capable of sliding vertically, a grooving tool is mounted on the tool holder, and the lower end of the tool holder is dynamically connected to the grooving driving device. 
     The grooving driving device includes a main motor fixedly mounted on the lower part of the machine frame, a gear is disposed on the power output shaft of the main motor, the lower part of the tool holder is provided with a rack engaged with the gear, and both sides of the rack is provided with guide fixing plates fixedly mounted on the machine frame. 
     As an improvement of the invention, a tool feed adjusting unit is further mounted on the vertical plate and includes an adjusting plate parallel to the vertical plate, the adjusting plate is connected to the vertical plate via a guide pin, the tool holder is slidably connected to the adjusting plate, an adjusting cylinder is mounted on the outer side surface of the vertical plate, the piston rod of the adjusting cylinder can pass through the vertical plate and extends to the adjusting plate, and a rubber spring is mounted on the guide pin positioned on the inner side of the adjusting plate. 
     The plate-clamping unit includes a back plate mounted between the upper supporting plate and the lower supporting plate, guide bolts capable of sliding pass through and are mounted on the back plate, pressure plates are fixedly disposed on the inner ends of the guide bolts, the outer end of the guide bolts are fixedly connected to a cylinder, the piston rod of the cylinder is capable of extending to the back plate, and springs are arranged between the pressure plates and the back plate. 
     The arc-curving unit includes guide rollers which are oppositely and fixedly disposed between the upper supporting plate and the lower supporting plate, the guide rollers provide a passage for a plate to pass through, arc-curving sleeves are sleeved outside the guide rollers, the front parts of the arc-curving sleeves form a plate inlet, the guide rollers have guide plates extending towards the plate inlet, the rear parts of the arc-curving sleeves form a corresponding plate outlet, the transverse width of the plate inlet is much larger than the width of the plate outlet, the side walls of the arc-curving sleeves at the outlet of the passage are respectively provided with press-curving rolling balls capable of rolling, and the arc-curving sleeves are dynamically driven by a servo motor fixedly mounted under the machine frame. 
     As a further improvement of the invention, a shearing unit is also mounted on the machine frame and includes a rotating shears mounted between the upper supporting plate and the lower supporting plate, the rotating shears is formed by an inner cylinder and an outer cylinder which coaxially rotate and are sleeved together, the front parts of the inner cylinder and the outer cylinder form a plate inlet, the cylinder /ails of the rear parts of the inner cylinder and the outer cylinder are oppositely provided with cutting edges, the outer surfaces of the lower parts of the cylinder walls of the inner cylinder and the outer cylinder are respectively provided with a transmission gear, the lower part of the cylinder wall of the outer cylinder is provided with a notch capable of exposing the lower part of the cylinder wall of the inner cylinder, both sides of the outer cylinder are respectively provided with a transmission rack engaged with the transmission gear, and the transmission racks are dynamically driven by a shearing motor to move in the same direction. 
     The inner cylinder is sleeved outside the arc-curving sleeves and coaxial with the arc-curving sleeves. 
     A groove-cutting unit is further mounted on the machine frame and positioned between the feeding unit and the grooving unit, the groove-cutting unit includes a supporting frame and a pressure plate device which are mounted on the machine frame, and an elevating device, a rotating device and a cutting device are mounted on the supporting frame. 
     The elevating device includes an elevating motor mounted on the machine frame, a transmission belt in transmission connection with the elevating motor, and an elevating frame slidably mounted on the supporting frame, wherein the elevating frame is fixedly connected with the transmission belt, and the other end of the transmission belt is provided with an iron counterweight through a pulley; the rotating device includes a rotating motor fixedly mounted on the elevating frame, and a turn table is disposed on the power output shaft of the rotating motor; the cutting device includes a cutting motor fixedly mounted on the turn table, the cutting motor is in a transmission connection with a cutting tool holder, the cutting surface of the cutting tool holder and the axial line of the power output shaft of the rotating motor are in the same plane; the pressure plate device includes a support connection plate mounted between the upper supporting plate and the lower supporting plate, rotating pressure feet are mounted on the support connection plate and fixedly disposed between the upper supporting plate and the lower supporting plate via rotating shafts, springs are arranged between the rotating pressure feet and the support connection plate whereby a plate passage is formed between the pressure feet and the support connection plate, the lower parts of the rotating pressure foot abut against a pressing plate articulated on the lower supporting plate, and the lower part of the pressing plate abuts against a pressing can driven by a groove-cutting pressure motor. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The invention is further described in connection with the accompanying drawings: 
         FIG. 1  is a structure diagram of the invention; 
         FIG. 2  is a structure diagram taken in A direction in  FIG. 1 ; 
         FIG. 3  is a structure diagram taken in B direction in  FIG. 1 ; 
         FIG. 4  is a structure diagram taken in C direction in  FIG. 1 ; 
         FIG. 5  is a structure diagram taken in D direction in  FIG. 1 ; 
         FIG. 6  is a structure diagram taken in E direction in  FIG. 1 ; and 
         FIG. 7  is a sectional structure diagram taken along F-F in  FIG. 6 . 
     
    
    
     Wherein,  1  is machine frame,  2  is upper supporting plate,  3  is lower supporting plate,  4  is main motor,  5  is gear,  6  is rack,  7  is grooving head,  8  is guide fixing plate,  9  is guide roller,  10  is cut groove,  11  is vertical plate,  12  is inner cylinder,  13  is tool holder,  14  is back plate,  15  is pressure plate,  16  is cylinder,  17  is top spring,  18  is guide bolt,  19  is electric control cabinet,  20  is adjusting plate,  21  adjusting cylinder,  22  guide pin,  23  is guide plate,  24  is arc-curving sleeve,  25  is servo motor,  26  is groove-cutting pressure motor,  27  outer cylinder,  28  is cutting edge,  29  is transmission gear,  30  is transmission rack,  31  is shearing motor,  32  is supporting frame,  33  is elevating motor,  34  is transmission belt,  35  is elevating frame,  36  is iron counterweight,  37  is rotating motor,  38  is turn table,  39  is cutting motor,  40  is cutting tool holder,  41  is raw material rotary disc,  42  is guide wheel group,  43  is driving roller,  44  is driving motor,  45  is support connection plate,  46  is rotating pressure foot,  47  is spring,  48  is rotating shaft,  49  is pressing plate,  50  pressing cam,  51  is slide rail,  52  is slide block,  53  is rubber spring,  54  is press-curving rolling hall,  55  is notch,  56  is grooving tool,  57  is grooving tool fixing plate, and  58  is positioning sleeve. 
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     The luminous character enclosing machine as shown in the drawings includes an upper supporting plate  2  and a lower supporting plate  3  which are mounted on a machine frame  1  oppositely, the left sides of the upper supporting plate and the lower supporting plate form a plate inlet, and the right sides of the upper supporting plate and the lower supporting plate form a plate outlet. A feeding unit, a groove-cutting unit, a grooving unit, an arc-curving unit and a shearing unit (the positions of the groove-cutting unit and the grooving unit can be exchanged, and the positions should be determined to facilitate convenient installation and maintenance) are disposed in succession on the upper supporting plate and the lower supporting plate from the left to the right. The feeding unit includes a raw material rotary disc  41  fixedly mounted on the lower supporting plate  3  and provided with a plate-stretch opening, guide wheel groups  42  are correspondingly arranged in pair between the upper supporting plate and the lower supporting plate, four to six groups of driving rollers  43  are disposed between the upper supporting plate and the lower supporting plate and dynamically driven by a driving motor  44 , the driving motor  44  is fixedly mounted on the machine frame  1  and drives the driving rollers  43  to rotate through a gear-rack transmission mechanism, and the driving rollers in each group are arranged oppositely and rotate in opposite directions to drive a plate to move forward. A grooving driving device and a plate-clamping unit are disposed on the machine frame  1 , as shown in  FIGS. 1 ,  3 ,  4  and  5 , a vertical plate  11  is arranged between the upper supporting plate and the lower supporting plate, the grooving driving device includes a maim motor  4  fixedly mounted under the machine frame  1 , the power output shaft of the main motor  4  is equipped with a gear  5 , a tool holder  13  is slidably connected to the vertical plate  11 , the lower part of the tool holder  13  is provided with a rack  6  which is engaged with the gear  5 , both sides of the rack  6  are provided with guide fixing plates  8  which are fixedly mounted on the machine frame  1  to ensure engagement between the rack  6  and the gear  5  whereby the rack  6  drives the tool holder  13  to move up and down, and the guide fixing plates  8  are fixedly on the machine frame  1 . The vertical plate  11  is equipped with a tool feed adjusting device which includes an adjusting plate  20  parallel to the vertical plate  11 , a vertical slide rail  51  is disposed on the adjusting plate  20 , the tool holder  13  is provided with a slide block  52  slidably fitted with the slide rail  51 , a grooving tool  56  is fixedly mounted on the tool holder  13 , an adjusting cylinder  21  is mounted on the outer side surface of the vertical plate  11 , the piston rod of the adjusting cylinder  21  can passes through the vertical plate  11  and extends to the adjusting plate  20 , a rubber spring  53  is disposed on a guide pin  22  positioned on the inner side of the adjusting plate  20  to ensure the distance and parallelism between the vertical plate  11  and the adjusting plate  20 , and a positioning sleeve  58  is also mounted on the guide pin  22  positioned between the vertical plate  11  and the adjusting plate  20 . The plate-clamping unit includes a back plate  14  fixedly mounted between the upper supporting plate and the lower supporting plate, a pair of pressure plates  15  which are symmetrically disposed and a cylinder supporting frame for a cylinder  16  are respectively mounted on both sides of the back plate  14  and guidably fixed via guide bolts  18 , the upper part and the lower part of the back plate  14  are respectively provided with four slidable guide bolts  18 , the inner ends of the guide bolts  18  are fixed to the pressure plates  15 , the outer ends of the guide bolts  18  are fixedly connected to the cylinder supporting frame, the piston rod of the cylinder  16  passes through the cylinder supporting frame and can extend to the back plate  14 , the two pressure plates  15  respectively correspond to the upper end and the lower end of the back plate  14 , the two pressure plates  15  and the upper part and the lower part of the back plate  14  are correspondingly provided with counterbores in which springs  17  are fixedly mounted to enable the pressure plates  15  and the hack plate  14  to form a plate passage between thereof, and the guide bolts  18  pass through the springs  17 . When the cylinder  16  is inflated, the piston rod of the cylinder acts on the back plate  14 , and then the pressure plates  15  comes close to the hack plate  14  along the lower supporting plate  3  to clamp a plate. 
     Referring to  FIG. 6  and  FIG. 7 , the arc-curving unit includes guide rollers  9  fixedly mounted between the upper supporting plate and the lower supporting plate, the guide rollers  9  provide a passage for a plate to pass through, arc-curving sleeves  24  are sleeved outside the guide rollers  9 , the front parts of the arc-curving sleeves  24  form a plate inlet, guide plates  23  extending to the plate inlet are arranged on the guide rollers  9 , the rear parts of the arc-curving sleeves  24  form a corresponding plate outlet, the transverse width of the plate inlet is much larger than the width of the plate outlet, the side wall of the arc-curving sleeves  24  at the outlet of the passage are respectively provided with press-curving rolling balls  54  capable of rolling, and the arc-curving sleeves  24  are dynamically driven by a servo motor  25  fixedly mounted under the machine frame  1 . A shearing unit is also mounted on the machine frame  1  and includes a rotating shears mounted between the upper supporting plate and the lower supporting plate, the rotating shears is formed by an inner cylinder  12  and an outer cylinder  27  which coaxially rotate and are sleeved together, the front parts of the inner cylinder  12  and the outer cylinder  27  form a plate inlet, the cylinder walls of the inner cylinder  12  and the outer cylinder  27  are oppositely provided with cutting edges  28 , the outer surfaces of the lower parts of the cylinder walls of the inner cylinder  12  and the outer cylinder  27  are respectively provided with a transmission gear  29 , the lower part of the cylinder all of the outer cylinder  27  is provided with a notch  55  capable of exposing the lower part of the cylinder wall of the inner cylinder  12 , both sides of the outer cylinder  27  are respectively provided with a transmission rack  30  engaged with the transmission gear  29 , the transmission racks  30  are dynamically driven by a shearing motor  31  to move in the same direction, the shearing motor  30  drives two rotating wheels in opposite directions to drive the transmission racks  30  such that the two transmission racks  30  can move in the same direction, the outer cylinder  27  is sleeved outside the arc-curving sleeve  24  and coaxial with the arc-curving sleeves  24 , and alternatively, the shearing unit and the arc-curving unit can be disposed separately such that a plate can be sheared after being arc-bent, so the operations of edge bending and arc curving of a stereoscopic luminous character edge is completed. 
     As shown in  FIG. 1  and  FIG. 2 , the groove-cutting unit includes a supporting frame  32  and a pressure plate device which are mounted on the machine frame  1 , and an elevating device, a rotating device and a cutting device are mounted on the supporting frame  32 . The elevating device includes an elevating motor  33  mounted on the machine frame  1 , a transmission belt  34  which is in transmission connection with the elevating motor  33 , and an elevating frame  5  slidably mounted on the supporting frame  32 , wherein the elevating frame  35  is fixedly connected with the transmission belt  34 , and the other end of the transmission belt  34  is provided with an iron counterweight  36  through a pulley; the rotating device includes a rotating motor  37  fixedly mounted on the elevating frame  35 , and a turn table  38  is disposed on the power output shaft of the rotating motor  37 ; the cutting device includes a cutting motor  39  fixedly mounted on the turn table  38 , the cutting motor  39  is in a transmission connection with a cutting tool holder  40 , a cutting shaft where the cutting tool holder  40  is positioned is fixedly mounted on two fixing plates which are fixedly disposed below the turn table  38 , a cutting blade is mounted on the cutting tool holder  40 , and the cutting surface of the cutting tool holder  40  and the axial line of the power output shaft of the rotating motor  37  are in the same plane; the pressure plate device includes a support connection plate  45  mounted between the upper supporting plate and the lower supporting plate, a pair of rotating pressure feet  46  are symmetrically mounted on the support connection plate  45  and fixedly disposed between the upper supporting plate and the lower supporting plate via rotating shafts  48 , springs  47  are arranged between the rotating pressure feet  46  and the support connection plate  45  whereby a plate passage is formed between the pressure feet  46  and the support connection plate  45 , a pressing plate  49  tightly abuts against the lower parts of the rotating pressure feet  46 , the middle part of the pressing plate  49  is articulated on the lower supporting plate  3 , and the lower part of the pressing plate  49  abuts against a pressing cam  50  driven by a groove-cutting pressure motor  26 . 
     A stereoscopic luminous character edge is enclosed with the invention as follows: a stainless steel band stretches out of the plate outlet of the raw material rotary disc  41  and is driven to move forward by the driving rollers  43  after passing through the guide wheel groups  42 , the grooving unit is started when the stainless steel band arrives at the grooving unit (the groove-cutting unit is not started temporarily because raw material is a stainless steel band), and the cylinder  16  is inflated simultaneously so that the piston of the cylinder  16  butts the back plate; because the pressure plates  15  and the cylinder  16  are mounted on both side of the back plate  14  and fixed by guide bolts  18 , the pop springs  17  between the pressure plates  15  and the back plate  14  are pressed whereby the stainless steel plate is held tightly by the pressure plates  15  and the back plate  14 , the tool holder  13  moves downward dynamically driven by the grooving driving device, and the grooving tool  56  mounted on the tool holder  13  can groove the stainless steel band. The stainless steel band is grooved for many times (generally twice) due to high hardness. After the grooving driving device drives the tool holder  13  to groove downward, the main motor  4  rotates reversely to drive the tool holder  13  to move upward when arriving at a certain position, in order to prevent the grooving tool  56  from touching the stainless steel band to cause scratches or non-collinear grooving lines when the tool holder  13  moves upward. The grooving tool  56  is fixedly mounted on a grooving tool fixing plate  57 , the upper end of the grooving tool fixing plate  57  is articulated on the tool holder  13 , the rear end of the grooving tool  56  extends into the tool holder  13 , and the grooving tool  56  and the grooving tool fixing plate  57  can rotate away from the stainless steel plate along the hinge shaft thereof, such that the tool holder  13  can not touch the stainless steel plate when moving upward. When the tool holder  13  moves up to a certain height, the main motor  4  rotates reversely again to drive the tool holder  13  to move downward for second grooving, the adjusting cylinder  21  is started simultaneously, the vertical plate  11  is fixedly mounted between the upper supporting plate and the lower supporting plate such that the piston of the adjusting cylinder  21  butts the adjusting plate  20 , the adjusting plate  20  moves forward a distance along the lower supporting plate  3  to adjust the amount of feed of the tool holder  13  whereby the grooving depth of the stainless steel band is increased to meet the requirement of edge bending (the adjusting plate moves forward a minimal distance, so that it can not affect the transmission connection between the gear  5  and the rack  6 ). Because the guide pin  22  passing through the adjusting plate  20  and the vertical plate  11  is provided, and the rubber spring  53  is arranged on the guide pin  22  positioned on the inner vertical surface of the adjusting plate  20 , the adjusting plate  20  moves forward a distance and can ensure the parallelism between the adjusting plate and the vertical plate  11 , so that the two grooving operations can be at the same grooving line. The rubber spring  53  plays a role of restoring the adjusting cylinder  21  after adjusting the feed of the grooving tool, and simultaneously the rubber spring  53  springs the adjusting plate  20  back to the original position such that grooving can be carried out at another position of the stainless steel character edge band. Arc curving is then carried out at a specified position of the stainless steel band with the arc-curving unit, and finally, the stainless steel character edge is cut by the shearing unit to complete the molding of the whole character edge. 
     Groove-cutting process of a plate is carried out as follows: an aluminum strip stretches out of the plate-stretch opening of the raw material rotary disc  41  and is driven to move forward by the driving rollers  43  after passing through the guide wheel groups  42 . When the plate moves to the groove-cutting unit and needs to be cut, the groove-cutting pressure motor  26  is started to drive the pressing cam  50  to rotate a certain angle to push the lower end of the pressing plate  49  a distance, and because the middle part of the pressing plate  49  is articulated on the lower supporting plate  3 , the upper part of the pressing plate  49  presses the two rotating pressure feet  46 , and the two rotating pressure feet  46  come close to the support connection plate  45  such that a plate passage becomes narrower to tightly hold the plate. The cutting motor  39  is started simultaneously to drive the cutting tool holder  40  to rotate, and the elevating motor  33  is started whereby the transmission belt  34  drives the cutting tool holder  40  to move downward and cut the plate; when the plate needs to be grooved on both sides, the upper supporting plate  2  is provided with cut grooves  10 , and after the elevating motor  33  drives the cutting tool holder  40  to a certain height, the rotating motor  37  is started to drive the cutting tool holder into the cut groove  10  to cut the other side of the plate, and because the cutting surface of the cutting tool holder  40  and the axial line of the power output shaft of the rotating motor  37  are in the same plane, the two cut grooves can be ensured to be on the both sides of the same position when the cutting blade mounted on the cutting tool holder  40  cut both sides of the plate. The rotating motor  37  can freely rotate at any angle under electric control to carry out grooving of different depths and directions, thereby meeting the grooving requirements of different character edge plates. 
     The operations of arc curving and cutting of a character edge band are realized with the arc-curving unit and the cutting unit as follows: a character edge hand plate enters arc-curving sleeves  24  from the guide plates  23 , the side walls of the arc-curving sleeves  24  at the plate outlet are longitudinally and evenly provided with press-curving rolling balls  55 , when a control program controls a servo motor  25  to rotate at a certain angle according to the requirement of a character, the arc-curving sleeves  24  rotate accordingly, and because the guide rollers  9  in the arc-curving sleeve  24  are fixed, the press-curving rolling balls  54  press the plate and bend the plate to a certain angle, and the rotation of the press-curving rolling balls  54  can eliminate sliding friction between the press-curving rolling balls and the plate during arc curving. After the arc curving is completed, the shearing motor  31  is started to drive the two transmission racks  30  to move in the same direction such that the inner cylinder  12  and the outer cylinder  27  rotate in opposite directions, the cutting edges  28  of the inner cylinder  12  and the outer cylinder  27  interact on each other to cut the character edge band to finish the molding of the character edge band. 
     In the invention, all motors and grooving driving devices such as the cylinder  16  are operated and controlled by an electric control cabinet  19  through electric control, and because the control principles and processes are well know in the prior art, there is no need to go into details here.