Device for collecting dust as fiber waste and the like on creel stand

Abstract: A fan (21) located in a lower part of an inner section of the creel stand (2) creates an air flow that extends upwardly through a cylindrical duct (20) to a ceiling plate (16) of the creel stand. The air then passes radially outwardly, and thence downwardly through an outer section (30) of the creel stand to filters (9,19) adjacent the bottom of the stand. One of the filters (19) undergoes rotary movement, and fiber waste is conducted from it to a collection source by a suction device.

Description: Field of the Invention This invention relates to an apparatus for collecting lint, dust and similar material, hereinafter referred to as fiber waste, from a creel stand associated with a knitting machine, and for thereby improving the environmental conditions in a knitting plant or factory. Background of the Invention The number of yarn bobbins mounted upon the creel stand associated with a knitting machine may number from about 30 to over 100. The quantity of fiber waste discharged from the yarn passing to and from the creel stand is therefore quite large, particularly when the yarn is comprised of cotton. After the fiber waste has become airborne, it will tend to settle upon and adhere to spare bobbins or yarns that are to be pieced together, thereby causing yarn breakage and defects in the fabric being knitted. This of course lowers the quality of the fabric, and also impairs the efficiency of the knitting operation. It has previously been proposed to direct a current of air downwardly from a fan or blower located above the creel stand. This approach is of little benefit, however, since the air flow merely temporarily displaces the fiber waste, and does not collect the same or prevent its migration to adjacent creel stands and/or knitting machines. It has also heretofore been proposed to enclose the creel stand by a hermetic covering, and to then collect the fiber waste by use of a motor driven fan and waste-collecting filters disposed within the hermetic covering. However, providing a hermetic covering is quite costly, and its presence complicates the knitting operation. The GB-A-2 087 543 relates to an apparatus for collecting fiber waste from a creel stand comprising an inner section and an outer section communicating adjacent the upper end thereof with said inner section and filter means mounted in the creel stand. Blowing means are arranged in the outer sections and the filter means are fixed ones. The creel apparatus discussed in the article published in 1989 in the publication "Filiére Maille No. 42" on page 10 under "Équipements Auxiliaires" blows air downwardly from a blowing means located adjacent the top of the creel stand under which there is provided one in each section. New air flows from outside the creel stand and passes through a filter located on the ceiling of the creel stand provided above the sections and the blowing means. The filter, which is a non-rotatable one, traps the lint from the air and the blowing means blow the air again downwards in the sections. Summary of the Invention A creel stand in accordance with the present invention is defined in the claims. The present invention provides a relatively simple and inexpensive apparatus for efficiently removing and collecting fiber waste from a creel stand, as a result of which the environment in the knitting plant or factory is cleaner, yarn breakage and defects in the knitted fabric are reduced, and the productivity and quality of the knitting process and the knitted fabric are improved. In a preferred embodiment, the fiber waste collecting apparatus of the invention includes a rotatable first filter means mounted in an inner central section of the creel stand; air suction and blowing means situated at an elevation and location adjacent the first filter means; a cylindrical exhaust duct located above the air suction and blowing means; a ceiling plate atop the creel stand; a second filter in an outer section of the creel stand; and drive means for rotating the first filter means. The air flow produced by the suction and blowing means associated with the first filter means passes upwardly through the inner section of the creel stand, and is then directed downwardly through the outer section of the creel stand. The air then passes to the filter means in the lower part of the creel stand. A small ceiling plate capable of being opened and closed is preferably provided on part of the large ceiling plate, for the purpose of controlling the force of the air current. During operation of the fiber waste collecting apparatus, a motor driven fan of the suction and blowing means creates an air current on its exhaust or downstream side that passes upwardly in the central section of the creel stand, then outwardly, and then downwardly through the outer section of the stand. The downwardly directed air current entrains fiber waste emerging from the yarn bobbins supported by the creel stand, and fiber waste emerging from the yarn guiding pipe associated with the creel stand. The downwardly conducted fiber waste adheres to the surface of the first filter means, to which it is attracted by the suction action of the motor driven fan. The fiber waste adhering to the first filter is removed and collected as the filter rotates past a suction nozzle adjacent such filter. Description of the Drawings Other features of the invention will be apparent from the following description of an illustrative embodiment thereof, which should be read in conjunction with the accompanying drawings, in which: FIG. 1 is a view partially in front elevation and partially in vertical section of an apparatus for collecting fiber waste from a creel stand associated with a circular knitting machine; FIG. 2 is a fragmentary top plan view of the circular creel stand of Fig. 1; FIG. 3 is an enlarged fragmentary elevational view of the upper portion of the creel stand of Fig. 1; FIG. 4 is an enlarged fragmentary view, partially in vertical section and partially in elevation, of ceiling plate and adjacent components of the creel stand; FIG. 5 is an enlarged view, partially in elevation and partially in section, of channel members and yarn guiding pipes secured therein; and FIG. 6 is an enlarged view, partially in elevation and partially in vertical section, of fiber waste collecting components and adjacent components of the creel stand. Description of the Illustrated Embodiments Referring more particularly to the drawings, Fig. 1 shows a circular knitting machine 1 having a large number of yarn feeding members to which yarn is supplied from a laterally adjacent creel stand 2 . Creel stand 2 has large diameter rings 3 and 4 adjacent its upper and lower ends, respectively. The height of stand 2 is illustratively about 1.9 meters, and the height of rings 3 and 4 is illustratively about 500 mm. A plurality of elongate support members 5 overlie the outer surfaces of rings 3 , 4 and extend between such rings in generally parallel relationship to the central axis of creel stand 2 . As is best shown in Fig. 6, bobbin holders 6 are secured to each support member 5 with screws or the like, and a yarn bobbin 8 is mounted upon the stem 7 of each holder 6 . Creel stand 2 further includes a smaller diameter ring 10 that is concentric with and spaced radially inwardly from ring 3 . Rings 3 and 10 are connected to each other by horizontal members 11 that extend radially toward the axial center of the creel stand. A plurality of channel members 12 (Figs. 2 and 5) are connected to and located at equal intervals around the exterior of ring 10 , in parallel relationship with the central axis of the stand. As shown in Fig. 5, each channel member 12 receives a.plurality of yarn guiding pipes 13 . A bolt 14 adjacent the open side of each channel member 12 prevents lateral movement of pipes 13 . Each bolt 14 has a band 15 secured to one of its ends for causing pipes 13 to face bobbins 8 . An eyelet 13' (Fig. 6) made of porcelain or the like is secured in the outlet or tip part of each yarn guiding pipe 13 . The yarn unwound from a bobbin 8 is guided to one of the eyelets 13' , and thence to knitting machine 1 after passing through yarn guiding pipe 13 . The upper portion of creel stand 2 further includes outer and inner partitions 17a , 17b , respectively, and a ceiling plate 16 . A soft vinyl sheet or other shielding member (not shown) covers ceiling plate 16 and part of outer partition 17a . Outer partition 17a is located at an elevation above that of the uppermost yarn bobbin 8 , and illustratively has a vertical dimension of about 500 mm. Inner partition 17b is spaced downwardly from ceiling plate 16 so as to provide an opening 17c permitting air currents to pass from an inner section 29 of stand 2 into an outer stand section 30 within which are located bobbins 8 . A filter member 9 may be and illustratively is also located within the lower part of outer stand section 30 . Referring now particularly to Figs. 3 and 4, a small ceiling plate 16a associated with large ceiling plate 16 is movable vertically between open and closed positions for the purpose of regulating the force of the air currents in stand section 29 . Upward adjustive movement of plate 16a discharges air laterally from the space 16c (Fig. 4) when the air current within stand section 29 is too strong. When small ceiling plate 16a is capable of being opened and closed, as shown, a plurality of support members 16b (Fig. 4) are provided between it and ceiling plate 16 . Referring now particularly to Figs. 1 and 6, a fiber waste collecting apparatus 18 located within the central inner section 29 of creel stand 2 includes a filter 19 , an exhaust duct 20 , a motor driven fan 21 , and a drive assembly 22 for rotating filter 19 . While duct 20 is illustratively of cylindrical shape, it might instead be of square or oblong polygonal shape. Duct 20 is bolted or otherwise fixedly secured to a stepped section 24 of a circular frame 23 having a diameter greater than that of the duct. The height and diameter of duct 20 are illustratively about 1.4 m and 0.6 m, respectively. A plurality of legs 25 are secured to the side of frame 23 . Fan 21 is secured below duct 20 to frame 23 and has its exhaust or air discharge side uppermost. If desired, a space may be provided between exhaust duct 20 and section 24 of frame 23 , and the exhaust duct may be of generally conical shape, i.e., it may have a larger diameter at its lower part and a smaller diameter at its upper part. Drive means 22 for rotating filter 19 is disposed adjacent motor 21a of fan 21 . The drive means includes a vertical shaft 27 and a gear motor 28 that are secured by a bracket 26 to motor 21a of fan 21 . Motor 28 operates at preselected time intervals and at preselected low speeds in accordance with the variable setting of a timer device (not shown). Operation of motor 28 imparts rotation to a pulley 34 upon the end of the drive shaft of motor 28 . Rotation of pulley 34 in turn imparts rotation, via a belt 34' , to a pulley 32 integral with a bearing 31 upon stationary shaft 27 of motor 21a . Four arms 33 are secured by snap rings or any other suitable fasteners to pulley 32 and extend radially outwardly from the pulley and from shaft 27 . Upturned outer end portions 33a of arms 33 support and are secured to filter 19 . The height of filter 19 is illustratively about 0.5 m and only slightly less than the height of circular ring 3 . The filter may be formed of a plurality of sections that are connected together, and has a plurality of holes extending through its outer wall. There preferably are about 3-6 holes per square centimetre (20-40 holes per square inch), and more preferably are about 4-5 holes per square centimetre (30 holes per square inch). In lieu of a filter, a metallic net or perforated steel sheet having equivalent holes may be employed. When fan 21 is energized it causes air to flow upwardly through and from duct 20 as is indicated in Fig. 1 by the upwardly pointing arrow depicted in the central part of the creel stand 2 . Upon reaching an elevation adjacent ceiling plate 16 the air flows radially outwardly, via the space 17c between the ceiling plate and ring, to outer section of stand 2 . Part of such air then flows downwardly along inner partition 17b , while another part of the air flows downwardly along outer partition 17a . As a result of the foregoing, fiber waste emanating from bobbins 8 and eyelets 13' of yarn guiding pipes 13 is conveyed downwardly by the downward air current. Part of the downwardly conveyed fiber waste adheres to filter 19 , and other of the fiber waste adheres to the outwardly disposed filter 9 . The fiber waste adhering to filter 19 is removed from it by a suction head 35 of a suction unit (not otherwise shown) schematically shown in Fig. 2 positioned adjacent the path of rotary movement of filter 19 . Fiber waste may alternatively be removed from filter 19 by moving the suction head of the filter unit along the filter surface to which the fiber waste adheres. Other fiber waste stripping means (not shown) may also be provided for stripping fiber waste from the area between filters 9 and 19 , if desired. When the creel stand is of a type upon which the bobbins are linearly arranged, a filter of flat shape instead of circular shape may be employed. While preferred embodiments of the invention have been shown and described, this was for purposes of illustration only, and not for purposes of limitation, the scope of the invention being in accordance with the following claims.

Claims: Apparatus for collecting fiber waste from a creel stand (2) comprising: an inner section (29) and an outer section (30) communicating adjacent the upper end thereof with said inner section (29); first filter means (19) mounted in said creel stand (2); and air suction and blowing means (21) mounted in said creel stand; characterized in that said first filter means (19) is rotatably mounted in said inner section (29) and said air suction and blowing means (21) is located in said inner section (29) adjacent said first filter means (19); and in that said apparatus further comprises an exhaust duct (20) located in said inner section (29) above said air suction and blowing means (21); and a ceiling plate means (16, 16a) adjacent the top of said creel stand (2) and overlying said inner section (29) for changing the direction and for regulating the force of the air currents flowing upwardly from said air suction and blowing means (21) through said exhaust duct (20) to said ceiling plate means (16, 16a) and outwardly into said outer section (30). Apparatus according to claim 1, in which the air flowing outwardly into said outer section (30) flows downwardly to said filter means (19) into said inner section (29). Apparatus according to claim 1 or 2, in which said ceiling plate means (16, 16a) includes a first ceiling plate (16) and a second ceiling plate (16a) being adjustably movable for said regulating of the force of the air currents. Apparatus according to one of the preceding claims, in which said creel stand (2) has an outer ring (3) and an inner ring (10) adjacent its upper end. Apparatus according to one of the preceding claims, further including second filter means (9) in said outer section (30). Apparatus according to one of the preceding claims, further including a suction nozzle (35) adjacent said first filter means (19) for removing fiber waste therefrom.

Inventors: HAYASKI KIYOSHI, TAKEMOTO SUMIO, HAYASKI, KIYOSHI, TAKEMOTO, SUMIO
Applicants: PRECISION FUKUHARA WORKS LTD, PRECISION FUKUHARA WORKS, LTD
Application year: 1992
Main classification: D04B35
IPC codes: B08B5, D04B35