IT202100001205A1 - MOTORIZED FILTER FOR AIR ON VENTILATION AND COLLECTION AIR VENTS USED FILTER - Google Patents

Description

MOTORIZED FILTER FOR AIR ON VENTILATION AND COLLECTION AIR VENTS USED FILTER

Field of application

The present invention refers to a motorized filter for air on ventilation and collection air inlets of the used filter, i.e. to the conformation of a dragging device of an air filter, generally in filtering fabric, with the filter that unwinds from the casing and support of the filter, in which the filter ? wound into a roll and unwound for use on the air inlet arranged there for the filtration of the air sucked in by it. The design of the spool allows it to be easily made to the size required for the size of roll filter being used. This filter, with dispenser casing for unwinding from a roll, is notoriously used in the intake openings of electrical panels, electronic equipment and similar containers where it is necessary to remove atmospheric dust from the incoming cooling air. That is? the dragger provides for cadenced movement of the filter fabric so as to present new filter fabric of the filter without human intervention as well as? collects the used filter impregnated with the dirt filtered from the air.

Known art

The state of the art includes filters for air vents in which the roll of filtering fabric is housed in a parallelepiped casing with a square base and sized to contain the wrapped roll of filter fabric. The filter fabric is unwound by the casing placed near the of the air inlet so as to cover the inlet itself to filter the cooling air sucked in by the equipment which must be filtered. Moreover, these filters in rolls are used on a continuous basis, according to the use of the equipment on which they are mounted, but with the necessity? to present new fabric to cover the air inlet to replace the filter fabric which becomes dirty with the dust retained by the sucked air during use.

The use, therefore, of the filter fabric in roll takes place with continuous maintenance and control of the capacity? to filter the air in the part of the filtering fabric which covers said suction mouth. That is? must the maintainer periodically check the capacity? to filter the filter fabric and arrange to position new filter fabric to cover the air inlet and collect the used filter. This maintenance, if carried out on a large number of filtration devices, becomes a considerable effort.

Therefore, in the prior art ? A filter cloth winding device from a roll-wound filter cloth dispenser has been developed and described in document JP 2015213898 A . equipped with rewinding able to collect the filter with electric control and with the possibility? of assembly in various ways. The device ? equipped with a filter housing that rotatably accommodates the filter from the roll from which ? done. The winding device rotates the shaft to wind the filter; furthermore, the winding device has a motor connected to the winding shaft of the filter, a unit? control checks the operation of the engine, and includes a unit? power that feeds the engine and the unit? control. The unit? control ? configured to rotate the motor for winding intermittently or with mode? continuous winding.

Also, in the technique ? known, from the prior document US 4,627,683, an air treatment apparatus, having an air flow passage and a support structure with said passage, ? described a filter in the form of a continuous ribbon wound in a roll on a cylindrical core and housed in a chamber applied to the apparatus; said housing chamber of the roll filter ? mounted on said support structure; a discharge slot from the chamber with a width equal to the passage and means for mounting said roll of filtering fabric and allowing the supply of the tape on said passage. Said means for mounting the roll of filter fabric in said chamber comprising a pair of joint shafts aligned and mounted in a fixed manner, when in position at the ends? of said chamber, against rotation and axial displacement in said chamber and spaced apart at a shorter length than the core being inserted into the ends? quarries of said core; the core material and shafts in the coupling provide surfaces of friction to produce frictional resistance which permits controlled rotation of the roll as the tape is dispensed through the slot by hand picking and stepwise wound onto the take-up roll used filter by extracting it from the roll of new filter fabric.

These devices have a limitation in the control of the winding of the filter as the filter is wound, due to the increase in the diameter of the motorized winding roll. In fact, even if the rotation control is done with an encoder, which verifies the angle of rotation, the thickness of the wound filter leads to an increase in the diameter of the roller itself with the variation of the length of the wound filter on equal terms. of measured rotation angle. That is? not there? the certainty of precise advancement, both continuous and in sections, of the new filter presented in front of the intake air mouth with the sole verification of the rotation angle of the filter winding roller; ? It is known that the materials used in fabric filters of this type vary in thickness. In addition, the rotation of the take-up roll is applied to the full width of the filter with the possibility of drive unbalanced if the assembly of the filter dispenser or the winding device is not ? been done accurately. Pi? again, the device, after the construction, ? obliged to operate for a fixed width of the filter that is wound, this due to the presence of a roller with a precise axial dimension. In fact, the filter winding device cannot? be used to wrap filters of different widths, the cio? each wrapping device must be used with a filter and filter housing of precise width.

In fact, the main limitation of the prior solutions described in the cited documents lies in the winding of the filter on a roller and, at the end of the winding, the roller must be removed from the casing of the motorized winding device with a rather lengthy intervention by the maintainer. A new filter dispenser can? be placed in place of the empty one, but the full roll of the wrapped and dust-impregnated filter must be removed from the device. Furthermore, this device, in addition to presenting the length limit of the filter mounted in the new filter dispenser, also presents the limit of the load of filter wound on the winding roller which cannot? exceed the dimensions of the take-up reel container, further limiting the versatility of use of the winding device of the filter, the cio? each winding device pu? be used with a pre-ordered thickness filter in its length casing that can? be contained in the wrapper.

This state of the art ? susceptible to significant improvements with regard to the possibility? to realize a motorized filter for air on ventilation air inlets and used filter collection, which overcomes the aforementioned limits of the known art, making possible a versatility? of use not previously achieved including the collection of the band filter when used and soiled by the dirt collected from the filtered air.

The technical problem, therefore, which lies at the basis of the present invention ? that of realizing a motorized filter for air on ventilation air inlets and used filter collection, as known in the art, but which is versatile and can be used with all dimensions of filter width and thickness of the material constituting the filter and, at the same time, can collect the used filter soiled with dirt.

A purpose inherent in the above glitch? to create a filter feed mechanism that is independent of the width of the filter itself and the thickness of the material used in the filter as well as? manage to collect the used and soiled filter.

A further and not least object of the present invention ? that of realizing the aforementioned mechanism in such a way as to make a dragging device versatile and reusable even after maintenance interventions and/or transfer to another air intake and collection of the used filter which requires different dimensions, in width and thickness of the filtering fabric filter used, without for this carrying out profound interventions on the aforementioned mechanism, simply by changing the roll filter dispenser and adjusting the filter dragging device to the new dimensional parameters.

Pi? still, a further aspect of the technical problem addressed concerns the remote control of the dragging device of the filter so? to make it continuously verifiable by the maintainer even remotely and make it with automated control in the global control of the machine plant in which ? entered, that is? informing the maintainer of the unwinding of the new filter and the collection of the dirty filter.

Summary of the Invention

This problem ? resolved, according to the present invention, by a motorized filter for air on ventilation air inlets and used filter collection present on a casing of machinery or electrical apparatus which requires filtering of the aspirated air, comprising a dispenser with a roll filter; ; a filter dragging mechanism for unwinding the roll filter from the dispenser and driven by an electric motor; characterized by what that the drive mechanism includes a lever system in which a mobile lever presser ? brought to press on the filter, by means of a dragger present at its extremity? front, and to drag it downwards by a predetermined length at each dragging cycle; the aforementioned dragging mechanism ? made on the two sides of the filter that is unwound by the dispenser; each side of the drag mechanism ? equipped with said linkage, one of which is motorized and the other driven, and the two linkages of the same dragging mechanism have identical dragging length and are operated synchronously and perform a complete cycle at each dragging action; the linkage ? connected to an electric motor on the power side of said drive mechanism; the synchronism of actuation of the two leverages ? obtained by means of a transversal axis of connection of them; to join the two sides? a lower stiffening current is present, together with a presser; moreover, the used filter dragged downwards is rolled up on a rotating pin placed in controlled rotation and actuated by the rotation of said transversal axis or rotation shaft of the lever system with a transmission of motion connected to this axis/shaft.

In a further embodiment, the linkage comprises a crank button on which ? made swinging the mobile pressure lever and a tracking wheel of the end? back of the lever against a contrast cam.

Furthermore, in an improved constructional embodiment in which the movable lever presser and the driver are associated with an elastic means which presses the driver against the filter being unwound; the same elastic means retracts the movable lever presser upon completion of the drive cycle of the lever mechanism with return to the starting point.

Pi? still, in a further variant of constructional form, to the crank button ? associated with a circular cam in contact, during the rotation of said circular cam, with a rotation cycle stop microswitch.

Furthermore, in a specific improved embodiment the drive mechanism has on the driven side a motion transmission between a rotation shaft of the lever system connected with said transversal connection axis of these lever systems and said rotating pin for winding the used filter.

Furthermore, in a further advantageous constructive form, the motion transmission is a belt transmission equipped with a driving pulley connected for rotation to said rotation shaft and a driven pulley connected to a sliding shaft for supporting and rotating said rotating pin for winding the used filter.

Pi? again, in one specific constructional form, the sliding shaft bears rotation and engages at one end? of the rotating pin by means of a front engagement in a seat for engagement in said end? of the pin.

Furthermore, in a variant of constructive form, the motion transmission? connected to the rotation of the rotating winding shaft of the filter used by an adjustable clutch.

Pi? again, in a variant of the embodiment: said adjustable clutch comprises adjustable elastic means which generate an axial elastic load for controlling the sliding action of the adjustable clutch.

Finally, in substitution of the previous constructive variant, a practical and economical embodiment, a slip of the transmission of the rotational motion from the rotation shaft to said rotating pin takes place by loosening the tension of the belt to allow a slip based on the diameter reached from the used filter winding on the rotating shaft.

Further characteristics and advantages of the present invention, in the realization of a motorized filter for air on ventilation air inlets and used filter collection, will result from the description, given below, of constructive and embodiment forms given for indicative and non-limiting purposes with reference to the nine attached drawing tables.

Brief description of the drawings

Figures 1 and 2 represent a perspective and schematic view of a motorized filter for air on ventilation air vents according to the invention in which the used filter is not collected, here applied to a casing wall to cover a vent intake air from outside; visible are a roll fabric filter dispenser, the filter dragging device; moreover, Figure 2 represents a schematic view similar to Figure 1 in which the driving mechanism ? opened for the introduction of a new filter with fabric roll replacing the upper dispenser.

- Figures 3, 4, 5 and 6 show schematic sections of the dragging mechanism of the filter in the various positions: start of grip on the filter (Figure 3) with the movable presser; dragging the filter (Figure 4) in which the presser drags the filter; dragging limit switch at the moment of detachment (Figure 5) of the mobile presser; finally in the return motion of the mobile presser to the starting position (Figure 6);

- Figure 7 represents a schematic side view of the drive mechanism equipped with collection on a used filter roll, here, however, Figure ? devoid of the wall of the casing concerned and the intake air mouth which is already filtered? shown in Figures 1 and 2 above;

- Figure 8 represents a schematic perspective view of the drive mechanism of Figure 7 seen from the side of said casing wall to show the magnetic gripping devices on the wall itself;

- Figure 9 represents a schematic perspective view and in partial transparency of the drive mechanism of Figure 7 so as to show the internal components on the driven side and on the driven side;

Figure 10 represents a schematic sectional view of the driving mechanism and the rotation and collection mechanism on a used filter roll;

Figure 11 shows a schematic front view of the dragging and rotation mechanism and used filter collection in the condition of removal of the complete roll of the used and rolled up filter;

Figure 12 represents a schematic perspective view of the turn-and-pick mechanism on a used filter roll with the assembly of a hollow pin for winding the used filter;

Figure 13 represents a schematic perspective view, enlarged, in semi-transparency of the driving mechanism from the driven side and of the transmission to the pin of the rotation mechanism and used filter collection;

- Figure 14 represents a schematic view in vertical section and axial to the pin of the mechanism for supporting, rotating and collecting the used filter;

- Figure 15 represents a perspective view of the dragging and support, rotation and used filter collection mechanism, here with positioned an underlying tray for collecting liquid sweats coming from the dirt collected from the air filtered by the used filter;

- Figure 16 represents a schematic perspective view of the drive and support, rotation and filter collection mechanism used on the duct side in the open position, to allow and facilitate the assembly of a new roll filter from a dispenser, however not shown here, similar to the representation in Figure 2.

Detailed description of an embodiment Figures 1 to 6 show a first embodiment of a motorized filter, according to the invention, equipped with a filter dragging mechanism comprising a dispenser 1 of the filter 2, made of filter fabric in rolls of known type, placed to cover an air suction mouth 3 on a part of a machine casing 4 which must be cooled with the air flow sucked in through the suction mouth. The driving mechanism 5 comprises a motorized side 6, i.e. a motorized mechanism which drags the filter 2 downwards, and a driven side 7, that is? a mechanism driven and actuated mechanically in synchrony with the mechanism of the motorized side, which also drags the filter 2 for the distance recorded with its setting and identical to it in its constitution. A transversal axis 8, keyed in rotation on both sides, motorized 6 and driven 7, realizes the mechanical synchronism between the two dragging mechanisms. A transversal presser 9, placed at the entry point of the filter 2 in the dragging mechanism 5, maintains contact during the dragging of the filter 2 with the wall of the casing 4 to cover the air intake mouth 3 on it , to prevent air from returning towards the suction mouth 3 precisely between the wall of the casing 4 and the filter 2 itself. Underlying the drive mechanism 5 ? a collection tray 10 of the filter 2 used is placed to prevent it from falling onto the floor or surface below said casing 4 in the absence of the tray. The motorized side 6 of the dragging mechanism 5 has a control panel 11 for the appropriate ignition commands, control of the various functions subsequently described and of the mode and value of the dragging distance of the filter 2.

In the sectional Figures 3 to 6 ? also visible is the shape of a lever system 12 which provides for dragging: it ? made identical both on the motorized side 6 and on the driven side 7 of the drive mechanism 5.

The linkage 12 ? consisting of a crank button 13 on which ? a mobile lever presser 14 made oscillating, equipped with a driver 15 on the end? front 16 of the lever, towards the surface where the filter 2 is dragged, and of the wheel 17 in contrast to a guide contrast cam 18, on the end? rear 19 of this lever, for the detached positioning of the mobile presser 14 in the return phase, visible in Figure 6; a half elastic 20 in traction, that is? a usual spiral spring keeps the wheel 17 and the contrast cam 18 in contact in the return phase of the lever system 12, thus detaching? the driver 15 from the filter 2. A rotation shaft 21, on which ? splined crank button, protrudes with extremity? outside the shell 22 of the driving mechanism 5, both on the driven side 7 and on the motorized side 6; on the ends? of the tree 21 facing ? said transversal axis 8 for carrying out the mechanical synchronism is keyed. On the rotation shaft 21, only on the side 6 of the motorized driving mechanism 5, ? associated with a circular cam 32, together with the crank button and which rotates in synchronism with the crank button 13 itself; to the circular cam ? associated with a microswitch 33 which detects the complete rotation of the shaft 21 so? to interrupt the rotation if a single and non-repeated cycle.

The union between the two sides of the dragging mechanism 5 ? made by means of a connection base 23 fixed to both sides, duct 7 and motorized 6, and on which the filter 2 is dragged by the contact made by the dragger 15 behind the action of the lever mechanism 12 on both sides of the dragging mechanism 5; this connection base also acts as a driving surface for the filter 2. The connection base stiffens the reciprocal position between the motorized side 6 and the driven side 7, moreover, this base, as visible in Figure 8, has on the face intended for contact with the surface of the casing 4 of the housings 24 for fixing permanent magnets 25 on the magnetic ferrous material of the casing 4, as usual for the dispenser 1 with filter roll 2.

In Figures 1 and 2 ? also shown is an adjustable support 34, prominent towards the center of the air intake mouth 3, but detached from it, as well as interposed between the filter 2 and the suction mouth and placed on the motorized side 6 of a dragging mechanism, positioning you at its end? a sensor 35 which detects the motion of the air or the light reflected by the surface of the filter 2 when it is soiled with dust captured by the filter itself. The brightness? reflected from the surface of the filter or the speed? of the air passing through the filter vary according to the level of dirt caused by the dust filtered by the sucked air. That is? a new filter has the maximum brightness? or speed? of the air and a dirty filter has lower values; this discriminant transmitted with an electronic signal to an electronic control and command card 27 present in the motorized side, allows it to control in an automated way the cycle of the dragging mechanism 5, driven by an electric motor 26, possibly powered by batteries not shown and housed in one or both casings on the two sides of the motorized and/or driven drive mechanism, causing it to start when a minimum control threshold is reached.

In Figures 1-2, 7-11, 12 and 14 ? shown the driving mechanism of the motorized filter in which the constituent parts, motorized side 6 and driven side 7 and 36, are made to tilt on a fixed structure 40 for supporting the driving mechanism 5 made to tilt. The constituent parts that are identical or with the same function are referred to with identical references. The two sides 6 and 36 of the rocking drive mechanism are joined by the transversal presser 9 and by a lower beam 41 which make their rocking movement rigid with respect to the fixed structure 40; the rocking movement takes place by means of rocking pins 42 present in the lower right and 44 left part of the fixed structure 40 coupled to corresponding rotation seats 45 present in the shell of the motorized sides 6 and rocking duct 36 of the dragging mechanism. The opening, that is? release from the closed position to the open position of Figures 2 and 16, takes place with the actuation by means of a hook lever 46 from a retaining notch 47 present in the upper right and left 48 part 49 of the fixed structure 40; the opening is facilitated by the presence of the gripping surface 50 associated with said hook lever and fixed to the skirt of each side of the driving mechanism. The driven side 36 differs from the driven side 7 by the presence of a transmission to a lower rotating pin 38 for winding the used filter 39 which otherwise would fall, as visible in figures 1-6, into the underlying collection tray 10; the used filter 39 ? also shown rolled up on said rotating pin 38 in the remaining Figures.

On the driven side 36 of the driving mechanism 5 of the used filter 39, as in Figures 9 and 13 , ? a rotary motion transmission 51 is arranged to rotate said pin 38 for winding the used filter 39. The motion transmission 51 is provided. driven by the rotation of the rotation shaft 21 in the same direction, advantageously, by means of a belt 52 with a driving pulley 53 on the shaft 21 and with a driven pulley 54 and a hollow hub 55 to provide support and effective control of the dragging of the pin 38 in the used filter winding 39. Inside the hollow hub ? inserted in free rotation a shaft 56 sliding in the axial direction which, for the rotation, is coupled with said driven pulley 54 by means of an adjustable clutch 57 as desired.

Furthermore, in Figure 14 ? visible the coupling between the adjustable clutch 57 and the sliding shaft 56 takes place by means of a rotating tube 58, on which the sliding shaft 56 is? keyed, and an axial elastic load 59 which tightens the driven pulley 54 against an annular reaction wall 60 present on the rotating tube 58 with the interposition of at least one friction disc 61. The adjustment of the tightening of the clutch takes place by pushing a spring 62 housed externally to said sleeve 58, with the spring tightened on the sleeve with a nut 63 for tightening the hollow hub 55, sliding axially on the sleeve, against the annular wall 60 of the sleeve. Moreover, said clutch loading spring 62 57 acts on said hollow hub by means of an annular cover 64 for closing the rotational support 65 and dragging said pin 38.

What? the sliding shaft 56 ? pushed axially by an elastic means 66, typically a spring, for the axial insertion of a front insert 67 of which ? equipped in coupling with the seat 68 of the front graft present on one extremity? 69 of said pin 38 for winding the used filter 39; an annular mushroom 70 allows the sliding shaft to be gripped to allow the front coupling 67 to be disengaged and inserted into the pin 38. This operation allows the pin 38 to be introduced and extracted, first empty and then with the used filter 38 rolled up on it as visible in Figures 11 and 12.

As can be seen in the Figures, the used filter 39 before being wound on the pin 38 is kept close to the vertical direction of sliding on the base 23 by means of a lower presser 71 which? supported, on the lower right 43 and left 44 parts of said fixed structure 40, with shelves 72 projecting downwards. Finally, in Figure 15 the filter drive mechanism 2 and used filter winding 39 ? combined with a basin 73 for collecting liquid exudations which, possibly, are impregnated in the used filter and wrapped around said rotating pin 38. This basin is? supported, with anchors 74 below the fixed structure 40, on both ends? and at an appropriate distance in a position below the dragging and winding mechanism of the used filter 39.

In Figure 9 ? furthermore, the internal constitution of the driving mechanism 5 is visible. The electric motor 26 drives the rotation shaft 21; with 27 ? the electronic board for controlling and actuating the driving mechanism 5 of the motorized filter and with electric power supply batteries, not shown, of the electric motor 26 and the electronic board 27 is indicated; the power can? be dual, but to be used as an alternative to said batteries, with a usual external electric power supply, which feeds the electronic card 27 and the electric motor 26 for its operation.

The use of the motorized filter for air on ventilation air inlets and filter collection used according to the invention takes place as described below in which in the positioning of the motorized filter on a casing wall 4 a dispenser 1, of wrapped filter 2 in roll, it is positioned above the air intake mouth 3. In manual use, positioning can? be imprecise, but with a motorized filter described here, the positioning must take place in the direction almost? horizontal in order to allow correct dragging of the filter 2 made of known type of woven material.

For the correct positioning of a dispenser 1 and therefore of the dragging mechanism 5, a positioning template is used, not shown, which has a body and prongs made to the width foreseen for the specific filter 2 to be mounted; Does this positioning template have prongs shaped to accommodate the ends? 48 and 49 of the fixed structure 40 of the driving mechanism as well as the prongs themselves placed at said expected width of the dispenser 1. The template ? equipped with bubble for horizontal positioning.

Moreover, the constitution of the dragging mechanism allows, in the construction, to create a reduced number of parts, ie? simplifying the material to be kept in stock, but being able to make a motorized filter 2 of the width desired by the purchaser quickly and easily by simply mounting different widths of different widths of pressers 9, of connection bases 23, of transverse axes 8, of currents lower 41, filter winding pins 38 and lower pressers 71.

After assembling the motorized filter, the user chooses the operating mode of the dragging. In the different ways of dragging the movement of the dragging mechanism ? always the same; in fact, upon starting, the lever system 12 always begins to rotate in the same direction, bringing the circular cam 32 to press the microswitch 33, thus? the crank button 13 rotates causing the lever system 12 to perform all the phases illustrated in Figures 3, 4, 5 and 6; in the pressure phase of the dragger 15 on the filter 2, the filter itself is dragged by a predetermined length at each cycle, that is? crank button turn; during the pressure of the driver 15 on the filter, the wheel 17 detaches from the contrast cam 18 and the elastic means 20 maintains the pressure of the driver 15 on the filter 2 constant, guaranteeing the pressure and carrying out the dragging. By continuing to rotate, the crank button 13 moves the movable lever presser 14 away from the filter 2 and with the contact between the wheel 17 and the contrast cam 18, the movable lever presser returns to its starting position; the position is reached when the circular cam 32 brings the microswitch 33 to block the rotation, being the same completed at a round angle. The rotational movement from the motorized side 6 is transmitted mechanically synchronously to the lever system 12 present in the driven side 7. In the lever system of the driven side there is no the circular cam 32 nor the microswitch 33 are present. Furthermore, the driven side has the transmission of the rotation motion 51 from the shaft 21 to the rotation and dragging support 65 of the pin 38 for winding and collecting the used filter 39. Therefore, upon assembly , after having correctly positioned the dispenser 1 on the air intake mouth 3 and the dragging mechanism of the filter 2 in a position below and aligned with the dispenser, the filter 2 can? be extracted from the dispenser and inserted into the drive mechanism. The mechanism is open, as in Figure 16, and the filter 2 is placed in front of the suction mouth as in Figures 1-2 and 7. The used filter 39 is placed against the front surface of the base 23, Figure 10, and dragged with deviation on the lower presser 71. So the filter, when assembled is still new, but which will then become in use? used filter 39, is wound on the rotating pin 38, Figures 7 and 9-16, so as to be collected by winding on said pin, preventing the filter from falling on the floor where ? placed the machinery, Figures 1-2, or also in the tray 10, Figures 3-6, with the aforementioned wall 4 and air intake mouth 3, Once the introduction of the filter on the rotating pin 38 is completed, the dragging mechanism 5 is closed by pushing the two motorized sides and conducted against the fixed structure 40 so that both hook levers 46, present on each side, result in engagement on the respective retaining notch 47. Therefore, the dragging mechanism of the filter 2 can? begin to operate with cadenced functioning by collecting the used filter 39 on the rotating pin 38 by winding it. It should be noted that the rotating pins 38 are mounted empty on the rolling mechanism and are disposable, i.e.? disposed of in the trash together with the used filter 39 wrapped around them.

In fact, the driven side with the transmission of the winding 36 has the transmission 51 which, even if realized as a simple belt transmission, manages to collect the used filter 39 by rolling it up on the pin 38. The belt transmission 52, if suitably loosely adjusted, does not drag the used filter 39 also in the short recovery phase of the dragging position, of the lever system 12, made by the pressers 14 in which the draggers 15 detach from the dragging surface, the front one of the base 23. The used filter 39, after dragging done by lever system 12, appears sketchy in the passage from the lower presser 71 to the rotating pin 38 on which it is wound.

Figures 11 and 12 show the removal of a rotating pin 38, with the used filter 39, by axially actuating the annular mushroom 70, i.e. extracting the sliding shaft 56 and the front clutch 67 associated with it from the seat of the clutch 68 present in the end? 69 of said rotating pin 38. The elastic means 66, typically a helical spring, keeps said clutch inserted for correct dragging.

In the illustrated construction form ? also provided is a transmission with tension control of the used filter 39 in the winding on the rotating pin 38, by means of the friction mechanism 57, visible in Figures 9, 13-14. In fact, the driven pulley 54 has a hollow hub 55 which slides axially and rotates on a sleeve 58, keyed with axial and rotating sliding with the sliding shaft 56 which drags, as mentioned, the rotating pin 38. Between said sleeve 58 and the hollow hub 55 of the driven pulley 54 ? acting an axial elastic load 59, that is? a load spring 62 of the clutch, which ? controlled by the axial positioning on the sleeve 58 of a locking nut 63 of the axial spring load 59. The thrust of the axial spring load presses the pulley 54 against an annular reaction wall 60 of which ? provided with said tube 58 and the friction action is applied by means of a clutch disc 61, placed between the driven pulley 54 and the annular wall.

From tests carried out said adjustable clutch 57 can? become necessary if the adjustment of the belt 52 is not suitably loose or even in the presence of a filter 2 with significant thicknesses.

Finally, the motorized filter described has an over-the-air connection of the electronic card 27 which presides over the control and command of the motorized filter. The activated data connection, of the known type with smartphone for example via WI-FI connection, it exchanges data on the status of the motorized filter it controls, in order to update the maintainer who checks the correct functioning of the motorized filter on the operating conditions, expected term of the filter 2, that is? on the need? future to replace the dispenser 1, as well as? blockages or malfunctions that may have occurred to the motorized filter.

The advantages of using a motorized air filter on ventilation air outlets and used filter collection can be summarized as follows.

The motorized filter of the invention described here is easy to assemble, moreover in the selection of the dragging mode, either timed for a precise pre-set time or length, or continuous, ie. steps taken continuously, or with verification of the parameters of the effectiveness of the filter (optical sensor or air flow sensor) or functionality? requests to the machinery are facilitated as they can be programmed from the control panel 11 which the drive mechanism has. That is, with the presence of the data connection over the air to the maintainer, it is easy to verify the specific parameters set on the timing of the intervention, that is? start-stop or different operating mode decided by the user or even starting according to the clogging of the filter itself, detected by the sensor 35 and communicated to the electronic board 27, controlled from the outside and with the setting command for the specific installation of the motorized filter carried out.

Pi? furthermore, the realization of the dragging with the lever system 12 is practical and with the dragging uniform, i.e.? without being subject to the variation of the feed parameters since the used and soiled filter 39 is wound up with recovery, but without interfering with the dragging mechanism 5; the operation, if any, ? always guaranteed by the batteries even in the event of a power failure from the external mains.

A further advantage is obtained in the production of a motorized filter according to the invention, in fact the production of filters of this type requires the realization of width dimensions of the filter 2 from a few tens of centimeters up to considerable lengths, even one meter or more; that is? the dragging mechanism allows you to maintain a reduced warehouse cio? a small number of pieces constituting the parts described, but also to quickly produce motorized filters with non-standard widths as it is possible to adapt the drive mechanism to dispensers of specific width; that is? the variation of the width dimension of the motorized filter is practical and economical.

Obviously, with a motorized filter for air on ventilation air inlets and filter collection used, as described above, a person skilled in the art, in order to satisfy specific and contingent needs, will be able to make numerous modifications, all however contained within the scope of protection of the present invention as defined by the following claims. In fact, albeit less conveniently, the fixed structure 40 and the tilting of the drive mechanism 5 can not be realized, that is? said dragging mechanism pu? be made in combination with the motion transmission 51 even only with fixed assembly, advantageously magnetic by means of permanent magnets 25 connected to shells 22 of the motorized 6 and duct 7 sides, how? known to be provided for the dispenser 1, directly to the wall of the casing 4 on which it is the intake port 3 of the air to be filtered is present.

Furthermore, the motion transmission 51 described can be made with gear wheels or with friction wheels; finally, it motion transmission pu? be made indifferently on the motorized side 6 or on the driven side 36; the possible adjustable clutch 57 being also able to be realized directly on the rotation shaft 21, that is? upstream of the motion transmission, or even downstream of it, that is? in connecting it to pivot pin 38 as shown.

Claims (11)

1. Motorized air filter on ventilation air inlets (3) present on a casing (4) of machinery or electrical apparatus that requires filtering of the aspirated air, comprising a dispenser (1) with filter (2) in roll ; a filter dragging mechanism for unwinding the roll filter from the dispenser and driven by an electric motor; characterized by what that the drive mechanism (5) comprises a lever mechanism (12) in which a lever-operated movable presser (14) is brought to press on the filter (2), by means of a dragger (15) present at its end? front (16), and to drag it downwards by a predetermined length at each dragging cycle; the aforementioned dragging mechanism ? made on the two sides of the filter (2) which is unwound by the dispenser (1); each side of the drag mechanism ? equipped with said linkage (12), one of which is motorized (6) and the other driven (7), and the two linkages of the same dragging mechanism have identical dragging length and are operated synchronously and perform a complete cycle at each drag action; the linkage (12) ? connected to an electric motor (26) on the motorized side of said drive mechanism; the synchronism of actuation of the two leverages ? obtained by means of a transversal axis (8) for connecting them; to join the two sides? a lower stiffening current (41) is present, together with a presser (9); this mechanism? fixed to the casing (4) by means of permanent magnets (25) integral with shells (22) of each motorized side (6) and conduit (7); moreover, the used filter (39) dragged downwards is rolled up on a rotating pin (38) placed in controlled rotation and activated by the rotation of said transversal axis (8) or rotation shaft (21) of the lever system (12) with a motion transmission (51) connected to it by axis/shaft. 2. Motorized filter, according to claim 1, wherein the linkage (12) comprises a crank button (13) on which ? made oscillating a mobile lever presser (14) and a tracking wheel (17) of the end? back (19) of the lever against a contrast cam (18). 3. Motorized filter, according to claim 2, wherein the movable lever presser (14) and the dragger (15) are associated with an elastic means (20) which presses the dragger against the used filter (39) which is dragged; the same elastic means retracts the movable lever presser (14) upon completion of the drive cycle of the lever mechanism with return to the starting point. 4. Motorized filter, according to claim 2 or 3, wherein the crank button (13) ? associated with a circular cam (32) in contact, during the rotation of said circular cam, with a microswitch (33) for stopping the rotation cycle. 5. Motorized filter, according to one of the preceding claims, wherein the driving mechanism has on the driven side (7, 36) a motion transmission (51) between a rotation shaft (21) of the lever system (12) connected with said axis transverse (8) for connection of these lever systems and said rotating pin (38) for winding the used filter (39). 6. Motorized filter, according to claim 5, wherein the motion transmission is a belt transmission (52) equipped with a driving pulley (53) connected in rotation to said rotation shaft (21) and a driven pulley (54) connected to a sliding shaft (56) for supporting and rotating said rotating pin ( 38) of used filter winding (39). 7. A motorized filter according to one of claims 5 or 6, wherein the sliding shaft bears rotation and engages at one end? (69) of the rotary pin (38) by means of a frontal engagement (67) in an engagement seat (68) in said end? of the pin. 8. Motorized filter, according to one of claims 1, wherein the motion transmission (51) is connected to the rotation of the rotating pin (38) for winding the used filter (39) by means of an adjustable clutch (57). The motorized filter according to claim 8, wherein said adjustable clutch comprises adjustable spring means (62) which generate an axial spring load (59) for controlling the slipping action of the adjustable clutch. 10. Motorized filter, according to one of claims 6 or 7, in which a slip of the transmission of the rotation motion (51) from the rotation shaft (21) to said rotating pin (38) occurs by loosening the tension of the belt (52 ) to allow a slip based on the diameter reached by the winding of the used filter (39) on the rotating pin. 11. Motorized filter, according to one of claims 1, 5, 8 or 10, wherein the drive mechanism (5) ? made to tilt on a fixed structure (40), by means of pins (42) and rotation seats (45) of the pins in the shells of both the motorized and driven sides; the fixed structure? equipped with a connection base (23) with a magnetic socket on the casing (4) where ? the air intake mouth (3) is present for fixing the complete driving mechanism (5) on the casing (4).