US3317947A

US3317947A - Pneumatic cleaning installation

Info

Publication number: US3317947A
Application number: US409692A
Authority: US
Inventors: Jacobi Ernst; Beck Heinz
Original assignee: Individual
Current assignee: Individual
Priority date: 1963-11-12
Filing date: 1964-11-09
Publication date: 1967-05-09
Anticipated expiration: 1984-05-09
Also published as: DE1291668B; GB1015070A; CH429524A

Description

y 9 I E. JACOBI ETAL 3,317,947

. PNEUMATIC CLEANING INSTALLATION Filed Nov. 9, 1964 5 Shets-Sheet 1 INVENTORS 5/171) BY He J/vz fi y 1967 E. JACOB! ETAL 3,317,947

PNEUMATIC CLEANING INSTALLATION Filed Nov. 9, 1964 SSheets-Sheet 2 I I i H 27a ji A "i Y rig A E Fig.3

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PNEUMATIC CLEAN ING INSTALLAT ION Filed Nov. 9, 1964 5 Sheets-Sheet 4 25/ "a E f Fig.6

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INVENTORS Ernf/ d and,

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United States Patent 3,317,947 PNEUMATIC CLEANING INSTALLATION Ernst Jacobi and Heinz Beck, both of Derchingerstr. 43, Augsburg, Germany Filed Nov. 9, 1964, Ser. No. 409,692 Claims priority, application Germany, Nov. 12, 1963,

J 24,732 30 Claims. (Cl. 15312) The invention concerns a pneumatic cleaning installation employing a carriage adapted to travel above a textile machine and having blowing and suction members dependent therefrom. Known travelling pneumatic installations of this type usually employ a carriage which can travel over a textile machine or line thereof under the action of driving means, for example, an electric motor, incorporated on the carriage, the same or different driving means serving for the drive of a fan or fans for the production of the suction and blowing air currents, filter means and a storage chamber for collected dust, fly, lint or the like also being mounted on the carriage. struction, primarily because its Working parts must be disposed in close relationship. Furthermore, such a carriage has intricate inner .air channels and is consequently expensive and is liable to breakdown and thus requires considerabl maintenance. In addition, not only rail tracks for the carriage, but also cables or busbars for feeding the electric motors on the carriage have to be present which further increases the complexity and cast of the installation, and decreases the reliability thereof. Thus for example, the fire hazard is increased in that the motors are supplied from a low voltage high current source, with a severe risk of sparks being produced unless the equipment is properly and expertly maintained.

It is amongst the object of the present invent-ion to provide an improved installation which overcomes at least to some extent the disadvantages aforesaid and which moreover has certain other advantages, such as for ex-- ample a decrease in the driving power required for the carriage.

The pneumatic cleaning device according to the invention includes at least one carriage adapted for movement over a line of textile machinery which carriage substantially carries only blowing and/ or suction cleaning members communicating with pressure and or suction chambers on the carriage, there being pressure and/or suction pipes connecting said chambers with a stationary fan-filter unit, said pipes being of a type which permit movement of the carriage.

The invention will be further apparent from the following description with reference to the several figures of the accompanying drawings, which show, by way of example only, a number of installations embodying the invention.

Of the drawings:

FIG. 1 is a side elevation of a first embodiment for operation on a single line of textile machinery;

FIG. 2 is a top view of the embodiment of FIG. 1;

FIG. 3 shows a top plan view of an installation incorporating several carriages, each similar to that of the arrangement of FIG. 1, for operation on several lines of textile machinery;

FIG. 4 shows a side elevation of a slightly modified installation seen on FIG. 3 in a direction corresponding with that of the arrow IV;

FIG. 5 shows an elevation of the installation of FIG. 4 in the direction of the arrows V on FIG. 4;

FIG. 6 shows a variation which may be applied to any of the arrangements of FIGS. 1-5;

FIG. 7 shows a compensating device;

Such carriage is heavy, and complicated in con- 3,317,947 Patented May 9, 1967 FIG. 8 shows side elevation of an embodiment utilizing a telescopic pipe; and

FIG. 9 shows a section of telescopic connection point of the embodiment of FIG. 8.

Referring now to FIG. 1, it will be seen that double line rail track 13, 13' is provided and located on supports 12 above a ring spinning machine 11. A substantially rectangular box shaped carriage 14 is provided and adapted to run on the

rail track

13, 13.

The interior of the carriage 14, which preferably extends projected laterally as at 15 and 15 beyond the rail track 13, 13' (see FIG. 2), is divided by a number of walls into pressure and suction chambers. For example, as can be seen in FIG. 2, two dividing walls 16 and 16' are provided so that one suction chamber 17 and two

pressure chambers

18 and 18 result.

The chamber 18 communicates with the chamber 18' by means of a connection (not shown). Pressure hoses 19 and 19' having blowing nozzles 20 and 20' depend on each side in known manner from the pressure chambers 18 and 18' respectively. Suction hoses 21 having suction nozzles 22 depend on each side from the suction chamber 17, and the nozzles 22 terminate adjacent the floor 23.

A fixed fan-filter unit 24 is located at or adjacent one end of the spinning frame 11. The unit 24 (shown schematically) essentially comprises a box which is divided into a pressure chamber 26 and suction chamber 27 by an intermediate wall 25 formed from a perforated sheet, thereby to constitute a filter.

A fan 28 is disposed in the chamber 26 and air flows through the filter wall 25 in the direction of the arrow 29. The suction chamber 27 which is of substantially L-shaped cross-section also serves as a collection chamber for fly or the like, and can be emptied at any time by the opening of a flap 30. Automatic or semi-automatic emptying is also possible if desired by provision of a suction pipe communicating with the chamber 27 via suitable means at a central position, the closure means'being opened periodically or non-periodically, automatically or manually.

The carriage 14 is connected to the fan-filter-unit 24 by two expandable airtight pipes 31 and '32 each of cou certina-type construction. The pipe 31 connects the

pressure chambers

18 and 18 of the carriage 14 with the pressure chamber 26 of the unit 24, and the pipe 32 forms a connection between the suction chamber 27 of the unit 24 and the suction chamber 17 of the carriage 14.

Drive means is provided consisting of an endless cable 33 which is led over pulleys 34 and 34', arranged adjacent to the ends of the spinning frame so that the carriage 14 can move to and fro over the whole length of the frame. The pulley 34' is driven by a belt 35 extending over a pulley 36 Which is driven from any suitable part of the mechanism of the spinning frame.

The carriage 14 is releasably linked or coupled onto the cable 33 by a pivoted or otherwise articulated member, in such manner that it is towed continuously to and fro by the cable or rope 33 in the direction of arrows 37 and 37' (FIG. 2), the carriage running to and fro from one end of the spinning frame to the other as indicated by the double arrow 38.

On the to and fro movement of the carriage 14 the

pipes

31 and 32 which are constructed as coil hoses shorten or lengthen appropriately. The

pipes

31 and 32 have a diameter of 20 cm., and are tightly connected by their ends to the appropriate chambers.

During the whole travel of the carriage 14 in both directions, blowing air flows out of the pressure chamber 26 through the pipe 31 into the pressure chambers 18 and 18' of the carriage and thence through the blowing hoses 19 and 19' and nozzles 20 and 20' onto parts of the spinning machinery, which can be selected as desired, by adjusting the lengths of the hoses 19 and 19: and the type of

nozzle

20 and 20 The air flOW lS indicated by the arrow 39. At the same time suction air, which is drawn through the suction pipes and

nozzles

21 and 22 and is laden with fly (fibrous dust), flows through the pipe 32 in the direction of the arrow 40 and enters the suction chamber 27 and thence passes as shown by arrow 29 through the filter wall into the pressure chamber 26 whence it is passed out through the pipe 31 as blowing air. Thus a substantially closed air flow results which is only modified by the distances between the

nozzles

20 and 20 on the one hand and 22 on the other. The same amount of air is always sucked up as shown by the arrow as is blown out as shown by arrow 39.

On passage through the filter wall 25 the fibrous fly settles thereon. Scrapers or the like, blowers, brushers or similar devices can be provided at 25, to convey the fly from the filter wall 25 in the direction indicated by arrow 41 into the lower part of the suction chamber 27. From there the dust and fly can be removed through the flap 30 or by other means as already stated.

Referring now to FIG. 3, wherein like parts are indicated by like reference numerals, a very advantageous, economical development of the invention, is shown. Carriages 14a, 14b, 14c, are in each case arranged on the

rails

13a, 13b, 13b, 13c, 13c, on, for example, six spinning machines set up parallel to one another and at the normal distance apart. Each carriage has two concertina-

type pipes

31a, 32a, 31b, 32b, The carriages are shown in various positions of travel. For example the position of carriage 14b is substantially one of the end positions wherein the

pipes

31b and 32b are greatly compressed. The position of carriage Me is substantially the other end position wherein the pipes 31c and 320 are fully expanded.

It should be noted that the suction chamber 27 of the arrangement of FIGS. 1 and 2 is here extended into a suction channel 27:: which is as long as the total length of the group of machines. In the same way the pressure chamber 26 of the arrangement of FIGS. 1 and 2 is extended to a pressure channel 26a which is as long as the channel 27a. Both channels are closed at one end by end walls 42 and 43. At the other end a curved connector 44 is provided which incorporates the fan 28 and filter wall '25.

It should be mentioned that the fan 28 is preferably arranged behind the filter 25 in the direction of flow, since the fan will forward air which is already filtered. All the

pipes

32a, 32b, 32c, of the

carriages

14a, 14b, 140 are attached to the suction channel 27a, and all the

pipes

31a, 31b, 31c are attached to the pressure channel 26a. From this it results that all the pressure chambers 1-8 and 18' of all the carriages 14 are fed with air from the pressure channel 26a and that all the suction chambers 17 of the carriages 1-4 supply fly laden air to the suction channel 27a.

It is convenient for the

pipes

31, 32a, to run substantially at right angles to the

channels

26a and 27a. This is not however absolutely essential and is largely determined by constructional conditions. Thus, the angle may be other than a right angle for an installation in a room having inclined walls.

As shown in FIG. 4, the channel 26a can be disposed in downwardly inclined relationship with respect to the channel 27a. In this case it is convenient to provide a rigid pipe 45 between each pipe 31 and the channel 26a.

The suction channel 27a may for example, if desired also have a square cross-section. As shown particularly in FIG. 5, a filter 47 in the form of an endless band is provided in place of the Wall 25, and is positioned in front of the fan 28 seen in the direction of air flow 46. The filter 47 is adapted to revolve continuously and is scraped at a suitable position by a scraper 48 so that the fly collected thereon falls into the suck or similar container 49 and deposits itself therein as indicated at 50. The waste container 49 is removable for emptying purposes, but may be arranged for automatic emptying if desired.

A feature which favours good operation of the cleaning installation and also the spinning process is the addition of a dampening member 51, which, seen in the direction of flow is advantageously located after or behind the fan 28 and correctly conditions the blowing air by spraying in liquid 52.

If desired, an air heating or air cooling device may be provided in addition, at any suitable position, such as for example at

positions

53 or 53 in the pressure channel 26a. It can also be arranged that the liquid or water spray 52 and/or the heating or cooling of the air 53 is adjusted or regulated in proportion to one or more predetermined or desired values.

Under some circumstances it is not absolutely necessary for the

pipes

31, 32 to run horizontally. If desired, a rise as shown in FIG. 1 from bottom right to top left may take place if the

pipes

31, 32 have some flexibility or if their attachments with the carriage and fan-filter unit are pivotal.

As shown in FIG. 6, the units 24 may be suspended substantially centrally above the machines 11, for example, from the ceiling of the spinning room so that the

pipes

31 and 32 swing to and fro in the fashion of a pendulum as the carriage travels to and fro along the track, lengthening and shortening correspondingly. Such an arrangement may also be used for a group of machines as in FIG. 3. In these cases each fan-filter unit 24 is fixed to the ceiling of the spinning room. The

chambers

26 and 27 of the unit 24 are connected with concertina-type

flexible pipes

31 and 32 which leads in the manner already described. The difference here as against the embodiments previously described is that the

pipes

31 and 32 enter the box or casing of the carriage 14 from above. In this case too, the carriage 14 is moved to and fro, by a cable 3 3, along the track rails 13 and 13.

FIG. 7 shows how any lateral force exerted on the carriage 14 by the

pipes

31 and 32 in extension or compression thereof may be compensated. Thus, by way of example, a counter spring 54 may be provided which is turned to the resilient forces of the

pipes

31 and 32.

FIGS. 8 and 9 show an embodiment wherein the expandable pipes are of telescopic construction.

Thus FIG. 8, shows, by way of example, an arrangement substantially as that of FIGS. 1 and 2, but wherein the

pipes

31 and 32 are replaced by telescopic units.

The carriage 14 which may be designed and built in the manner already described runs on a rail 13 which is located adjacent to or above the spinning machine 11. Telescopic pipe units are arranged between the carriage 14 and the

chambers

26 and 27, of the fan-filter unit 24. Each pipe consists of a plurality of individual telescopic pipes 80" and so on which can be pushed into and drawn out of one another, the telescopic pieces 80 on the extreme left (FIG. 8) being secured to the

chambers

26 and 27 and the pieces 80" at the extreme right being attached to the carriage 14. When the carriage 14 moves to the left, the individual telescopic pieces 80', 80" push into one another, and conveniently and advantageously support rollers 81', 81 are arranged on the ends of same or all of the telescopic pieces 80', 80" etc. The support rollers may run on the rail 13 or on a separate rail, which is present in any case and ensures the alignment of the individual telescopic pieces 80', 80".

A connection between the telescopic pieces 80', 80" is shown by way of example in detail in FIG. 9 on an enlarged scale. Such connection points are in each case present between adjacent telescopic pieces. As shown in FIG. 9 the inter-embracing ends 82 and 83 of the telescopic pieces 80' and 80 can be formed with corrugations. The difference in diameter between the pieces 80' and 80" substantially corresponding with the Weight of the corrugations. The end 82 carries at a suitable position on the periphery thereof a sliding seal ring '84, consisting of a flexible, resilient material for example a rubber of suitable shore-hardness, or a plastic. The sealring 84 is in sliding contract with the inner wall of the piece 80' and moreover in the uncorrugated part thereof. The end 83 carries an inner seal-ring 85 which is adapted to slide on the uncorrugated part of the outer wall of the piece 80. A suificient seal is thus produced by these seal-rings 84 and '85. However other methods of sealing may of course be used.

The twofold arrangement of rings, namely 84 and 85 also ensures a proper alignment of the pieces 80" and 80".

It is advantageous to provide a very resilient sealing lip or sealing lip ring 86 which is tightly secure-d on the end of piece 80'--i.e., the telescopic piece of larger diameter in such a way that the free end 86' of the lip ring 86 is capable of sliding on the outer wall of 80" with resilient contact.

It has become evident that with such telescopic pipes a very wide range of alteration in length is obtainable, ratios of 1:10 between the shortest and longest lengths being readily available. It should also be added that, according to invention it is possible not to take the drive for the carriage from the textile machine itself, but to provide, in place thereof, for the direct drive of the cable pulleys 34' an electric motor mounted on the textile machine frame or elsewhere. A similar electric motor can be arranged in the same way for the cable pulley 36 for example co-axial with the pulley 36. Such drive by electric motor would be chosen, for example, if for particular reasons, taking the drive from the textile machine itself is not possible or impractical. The use of expandable pipes opens up an interesting possibility, in that the low pressure produced within the pipe unit due to the stationary suction (sucking from the chamber 27) can draw the carriage in the direction of the fixed pipe end, as a result of the force which according to FIG. 8, then acts on the carriage from right to left, this force being calculated substantially from the difference between the atmospheric air pressure and the smaller pressure ruling in the low pressure telescopic pipe, the total pushing or drawing force being the product of the crosssectional surface of the pipe and the pressure difference.

If for example two concertina-type pipes similar to those in FIG. 2 of the drawing wherein the one feeds pressure air and the other suction air are present, then by suitable switching of the air currents (if desired controlled in a manner depended on travel of the carriage), to effect complete or partial closure for the attachment area of the concertina-type pipes to the carriage, a purely pneumatic drive can be obtained for the carriage, wherein (see FIG. 2) in the one case the excess pressures pushes the carriage to the right and in the other case the low pressure draws the carriage to the left. The working will however generally be such that, for example, with a pendulating the textile machine will only be sucked (with full closure), or sucked and blown to a lesser degree, during one direction of travel and only blown (with complete closure), or (with partial closure) blown and sucked to a lesser degree during the opposite direction of travel.

The new principle of using or making available the high and low pressures in the pipes for the movement of the carriage, can be employed when the pipes are of a type which have a tendency to bulge out or move out laterally, in which case guides to keep the pipes straight should be provided.

It will be appreciated that it is not intended to limit the invention to the above examples only, many variations, such as might readily occur to one skilled in the art, being possible, without departing from the scope thereof.

What we claim is:

1. A travelling pneumatic cleaning installation for textile machinery and the like comprising in combination, at least one carriage adapted to be moved over a line of the machinery to be cleaned; at least two chambers on said carriage; a fixed stationary fan-filter unit in the vicinity of said machinery, said fan-filter unit having a suction inlet end and a pressure outlet end; at least two collapsible and extensible pipe means, one of said pipe means being permanently connected at one end thereof to said suction inlet end of said unit and at the other end thereof with one of said chambers and the other of said pipe means being permanently connected at one end thereof to said pressure outlet end of said unit and at the other end thereof with the other of said chambers, whereby said chambers are held at a pressure different from atmospheric pressure and the pressure in one chamber different from the pressure in the other chamber; and a number of ducts communicating at one end thereof with said chambers, respectively, and each having an other open end directed towards said machinery so as to produce between said open ends of said ducts currents of air for cleaning purposes.

2. A travelling pneumatic cleaning installation according to claim 1 wherein said pipe means extend substantially horizontally between said carriage and said fan-filter unit. 3. A travelling pneumatic cleaning installation according to claim 2 wherein each pipe means includes a plurality of telescopically interconnecting pieces, each of tubular section.

4. A travelling pneumatic cleaning installation according to claim 3 wherein support rollers are provided on at least some of said pieces.

5. A travelling pneumatic cleaning installation according to claim 4 wherein the ends of said telescopically interconnecting pieces are formed with corrugations.

6. A travelling pneumatic cleaning installation according to claim 5 wherein external and internal sealing rings are provided for each said piece, said rings being capable of sliding on the uncorrugated areas of the corresponding inner and outer surfaces of said pieces, respectively, thereby to form an airtight seal therebetween. 7. A travelling pneumatic leaning installation accord ing to claim 6 wherein an annular sealing lip is provided on one end of each said piece, said lip projecting substantially thereover, the free end of said lip being adapted to slide to form a resilient seal on the outer surface of the following telescopically interconnecting piece of smaller diameter, the lip consisting of a resilient material. 8. A travelling pneumatic cleaning installation accordng to claim 3 wherein the ends of said telescopically interconnecting pieces are formed with corrugations. 9. A travelling pneumatic cleaning installation according to claim 8 wherein external and internal sealing rings are provided for each said piece, said rings being capable of sliding on the uncorrugated areas of the corresponding inner and outer surface of said pieces, respectively, thereby to form an airtight seal therebetween.

10. A travelling pneumatic cleaning installation according to claim 9 wherein an annular sealing lip is provided on one end of each said piece, said lip projecting substantially thereover, the free end of said lip being adapted to slide to form a resilient seal on the outer surface of the following telescopically interconnecting piece of smaller diameter, the lip consisting of a resilient material.

11. A travelling pneumatic cleaning installation according to claim 2 wherein each said pipe means is of resilient concertina-type coiled construction.

12. A travelling pneumatic cleaning installation according to claim 11 wherein resilient spring means are provided in connection with said carriage to compensate for any force placed thereon by the concertina-type pipe means.

13. A travelling pneumatic cleaning installation according to claim 12, wherein at least one blowing pipe means and at least one suction pipe means is provided, and including means for periodically restricting at least to some extent the air flow in each said pipe means alternately, whereby the carriage is caused to move to and fro over the line of machinery under pneumatic action.

14. Travelling pneumatic cleaning installation according to claim 13 and adapted to operate on a plurality of lines of textile machinery, arranged in parallel, there being one said carriage for each said line, and including two air channels one of which is connected to said suction inlet and the other of which is connected to said pressure outlet of said fan-filter and extending from the same in a line substantially at right angles to the direction of said lines of machinery, said pipe means connecting said carriages with said channels.

15. Travelling pneumatic cleaning installation according to claim 11 and adapted to operate on a plurality of lines of textile machinery, arranged in parallel, there being one said carriage for each said line, and including two air channels one of which is connected to said suction inlet and other of which is connected to said pressure outlet of said fan-filter unit and extending from the same in a line substantially at right angles to the direction of said lines of machinery, said pipe means connecting said carriages with said channels.

16. A travelling pneumatic cleaning installation accoridng to claim 3, wherein at least one blowing pipe means and at least one suction pipe means is provided, and including means for periodically restricting at least to some extent the air flow in each said pipe means alternately, whereby the carriage is caused to move to and fro over the line of machinery under pneumatic action.

17. Travelling pneumatic cleaning installation according to claim 16, and adapted to operate on a plurality of lines of textile machinery, arranged in parallel, there being one said carriage for each said line, and including two air channels one of which is connected to said suction inlet and the other of which is connected to said pressure outlet of said fan-filter unit and extending from the same in a line substantially at right angles to the direction of said lines of machinery, said pipe means connecting said carriages with said channels.

18. Travelling pneumatic cleaning installation according to claim 1 wherein said fan-filter unit is disposed substantially centrally above said line of machinery, said pipe means being constituted by collapsible flexible hoses.

19. A travelling pneumatic cleaning installation according to claim 18 including a towing cable in the form of an endless band mounted above said line of machinery, an articulated connection between said carriage and said towing cable, and means to drive said cable, whereby said carriage moves to and fro over said line of machinery.

20. Travelling pneumatic cleaning installation according to claim 19 wherein said towing cable is arranged to be driven from the motion of said textile machinery.

21. A travelling pneumatic cleaning installation according to claim 1 including a towing cable in the form of an endless band mounted above said line of machinery, an articulated connection between said carriage and said towing cable, and means to drive said cable, whereby said carriage moves to and fro over said line of machinery.

22. A travelling pneumatic cleaning installation according to claim 21 wherein said towing cable is arranged to be driven from the motion of said textile machinery.

23. A travelling pneumatic cleaning installation according to claim 2, including a towing cable in the form of an endless band mounted above said line of machinery, an articulated connection between said carriage and said towing cable, and means to drive said cable, whereby said carriage moves to and fro over said line of machinery.

24. A travelling pneumatic cleaning installation according to claim 23 wherein said towing cable is arranged to be driven from the motion of said textile machinery.

25. A travelling pneumatic cleaning installation according to claim 1 wherein the filter of said fan-filter unit is disposed on the suction side of said fan, and including a receptacle which may be emptied by suitable means to collect material gathered on said filter.

26. A travelling pneumatic cleaning installation according to claim 25 including means for scraping material collected on said filter and delivering same to said receptacle.

2'7. Travelling pneumatic cleaning installation according to claim 1 wherein said fan-filter unit incorporates means for conditioning the air circulated thereby.

28. A travelling pneumatic cleaning installation according to claim 1 and adapted to operate on a plurality of lines of textile machinery, arranged in parallel, there being one said carriage for each said line, and including two air channels one of which is connected to said suction inlet and the other of which is connected to said pressure outlet of said fan-filter unit and extending from the same in a line substantially at right angles to the direction of said lines of machinery, said pipe means connecting said carriages with said channels.

29. Travelling pneumatic cleaning installation according to claim 2 and adapted to operate on a plurality of lines of textile machinery, arranged in parallel, there being one said carriage for each said line, and including two air channels one of which is connected to said suction inlet and the other of which is connected to said pressure outlet of said fan-filter unit and extending from the same in a line substantially at right angles to the direction of said lines of machinery, said pipe means connecting said carriages with said channels.

30. Travelling pneumatic cleaning installation according to claim 1, wherein said fan-filter unit includes means for moistening the air circulated thereby.

References Cited by the Examiner UNITED STATES PATENTS 1,630,972 5/1927 Schmid 15312 2,000,112 5/1935 Wheller. 2,431,726 12/1947 Bechtler. 2,830,510 4/1958 Mariani et al. 3,003,177 10/1961 Hijiya 153 12.1 3,018,503 1/1962 Hijiya et al. l5-352 3,045,274 7/1962 Sohler 15352 X FOREIGN PATENTS 3,l13 2/1909 Great Britain. 907,545 10/1962 Great Britain. 635,214 3/1962 Italy.

ROBERT W. MICHELL, Primary Examiner.

Claims

1. A TRAVELLING PNEUMATIC CLEANING INSTALLATION FOR TEXTILE MACHINERY AND THE LIKE COMPRISING IN COMBINATION, AT LEAST ONE CARRIAGE ADAPTED TO BE MOVED OVER A LINE OF THE MACHINERY TO BE CLEANED; AT LEAST TWO CHAMBERS ON SAID CARRIAGE; A FIXED STATIONARY FAN-FILTER UNIT IN THE VICINITY OF SAID MACHINERY, SAID FAN-FILTER UNIT HAVING A SUCTION INLET END AND A PRESSURE OUTLET END; AT LEAST TWO COLLAPSIBLE AND EXTENSIBLE PIPE MEANS, ONE OF SAID PIPE MEANS BEING PERMANENTLY CONNECTED AT ONE END THEREOF TO SAID SUCTION INLET END OF SAID UNIT AND AT THE OTHER END THEREOF WITH ONE OF SAID CHAMBERS AND THE OTHER OF SAID PIPE MEANS BEING PERMANENTLY CONNECTED AT ONE END THEREOF TO SAID PRESSURE OUTLET END OF SAID UNIT AND AT THE OTHER END THEREOF WITH THE OTHER OF SAID CHAMBERS, WHEREBY SAID CHAMBERS ARE HELD AT A PRESSURE IN ONE CHAMBER ATMOSPHERIC PRESSURE AND THE PRESSURE IN ONE CHAMBER DIFFERENT FROM THE PRESSURE IN THE OTHER CHAMBER, AND A NUMBER OF DUCTS COMMUNICATING AT ONE END THEREOF WITH SAID CHAMBERS, RESPECTIVELY, AND EACH HAVING AN OTHER OPEN END DIRECTED TOWARDS SAID MACHINERY SO AS TO PRODUCE BETWEEN SAID OPEN ENDS OF SAID DUCTS CURRENTS OF AIR FOR CLEANING PURPOSES.