Title of Invention

A DEVICE IN A DRAW FRAME COMPRISING A SUCTION DEVICE FOR REMOVING DUST, FIBRE DUST AND THE LIKE

Abstract

The invention relates to a device in a draw frame comprising a suction device for removing dust, fibre and the like, a sliver funnel (10) and a pair of draw-off rollers (8,9) are provided at an outlet of the draw frame immediately after a web-guiding element (7), the suction removal device (14) is enabled to encompass the region between the outlet (10b) of the sliver funnel (10) and the nip (a) between the draw-off rollers (8,9), characterized in that a flow channel (15) of the suction removal device (14; 14a, 14b) is arranged such that the flow channel (15) encompasses the intake region (10a) of the sliver funnel (10) and projects laterally beyond the intake region (10a) of the sliver funnel (10).

Full Text

The invention relates to an arrangement at a draw frame comprising a suction device for removing dust, fibre dust and the like, in which a web-guiding element, a sliver funnel and a pair of draw-off rollers are present at the outlet of the draw frame immediately after the drawing system, the suction removal device being able to encompass the region between the outlet of the sliver funnel and the nip between the draw-off rollers. In a known draw frame, open suction sites are arranged in the vicinity of the draw-off rollers and the sliver funnel in order to remove fibre dust that has been released. As a result of the intensive emergence of fibre and dust particles having considerable dynamic energy at locations where the fibre sliver is being compressed, the open suction sites are not able to prevent contamination of the environment sufficiently. Some of the waste particles having impetus in different directions fly past the suction sites. The problem underlying the invention is accordingly to provide an arrangement of the type described at the beginning that avoids the mentioned disadvantages and in particular effectively catches and removes the waste that is released. The problem is solved by the characterising features of claim 1. As a result of the measures according to the invention, it is possible to enclose the sources of waste in such a manner that the streams of dust and fibre are specifically directed and conveyed to the suction sites provided for their removal. The integration of positioning elements into the geometry of the suction removal channels creates construction elements having a twofold function. In that manner, it is possible for the region between the drawing system and the draw-off rollers to be kept clean by suction removal. At the same time, accessibility for maintenance and servicing is improved considerably. Claims 2 to 25 contain advantageous developments of the invention. The invention will be described hereinafter in greater detail with reference to embodiments shown in the accompanying drawings, in which: Fig.1 is a diagrammatic side view of a web-guiding element, a sliver funnel and a pair of draw- off rollers, and the arrangement according to the invention, positioned downstream of a drawing system; Fig. 2 is a plan view of the cross-section of the flow channel of the suction removal device in the region upstream of the sliver funnel; Fig. 3 is a perspective view of the suction removal pipe comprising a suction removal element to cover the flow channel; Figs.4a, 4b show the suction removal device according to the invention in the operating position (Fig. 4a) and in a position in which it has been pivoted away (Fig. 4b); and Fig. 5 is a perspective view of the arrangement according to the invention with the hood of the drawing system pivoted open. According to Fig. 1, a draw frame, e.g. a Trutzschler TD 03 draw frame, comprises a drawing system 1 having a drawing system intake and a drawing system outlet. The fibre slivers 2, emerging from cans, enter a sliver guide and, drawn by draw-off rollers, are conveyed past a measuring device. The drawing system 1 is designed as a 4 over 3 drawing system, that is to say it consists of three lower rollers I, II, III (I lower output roller, II lower middle roller, III lower intake roller) and four upper rollers 3, 4, 5, 6. In the drawing system 1, the fibre bundle 2 is drawn from a plurality of fibre slivers. The draft consists of preliminary draft and main draft. The pairs of rollers 6/III and 5/II form the preliminary draft zone and the pairs of rollers 5/II and 3,4/I form the main draft zone. The drawn fibre slivers (fibre web 13) arrive at a web-guiding element 7 in the drawing system outlet and are drawn by means of the draw-off rollers 8, 9 through a sliver funnel 10, in which they are combined to form a fibre sliver 11, which is subsequently deposited in cans (not shown) by way of a can coiler 12. Reference letter A denotes the direction of feed of the fibre bundle. Between the web-guiding element 7 and the draw-off rollers 8, 9 there is a suction removal device 14. The flow channel 15 (see Fig. 2) of the suction removal device 14 is arranged upstream of the intake opening 10a of the sliver funnel 10 and at the outlet opening 10b and at the nip between the draw-off rollers 8, 9, overlapping each of them. According to Fig. 2, the web-guiding element 7 is of funnel-like shape and comprises an open side 7a (intake-side opening) and a throughput opening 7b. Connected to the throughput opening 7b are transfer pipes 16, 17 that convey the combined fibre web 13 into the sliver funnel 10. In operation, the fibre web introduced passes through the intake opening 10a, through the interior in the form of fibre sliver 11, through the outlet opening 10b and then through the nip a between the draw-off rollers 8, 9. The fibre material is compressed both on entering the sliver funnel 10 and in the roller nip a, air being pressed out, which air escapes in the direction of arrows C, D (at the sliver funnel 10) and E, F (at the draw-off rollers 8, 9) against the direction of feed B. Dust, fibre dust and similar waste emerge with the air and are indicated diagrammatically by the arrows C and D. The flow channel 15 of the pneumatic suction removal device 14 encompasses the intake region 10a of the sliver funnel 10 and in that manner removes the waste C, D by suction. Reference numeral 18 denotes the holding device for the sliver funnel 10. According to Fig. 3, the suction removal device 14 comprises a suction pipe 14a, at one end of which there is a cover element 14b. The other end 14c of the suction pipe 14a is connected to a source of suction air (not shown). The roof-like cover element 14b is constructed in two parts and consists of a part 14b1 and a part 14b2, part 14b being attached securely at the end of the suction pipe 14a. Parts 14b1 and 14b2 surround the transfer pipe 17, which passes through an opening 14d between parts 14b1 and 14b2 (see Fig. 4a) . As shown in Fig. 4a, the flow channel 15 is covered by the cover element. The flow channel 15 encompasses the intake region 10a of the sliver funnel (10) and projects beyond the intake region 10a in an approximately annular manner at a lateral spacing b (see Fig. 2). As a result, an open circumferential flow channel 15 is formed. The internal wall surface of parts 14b1 and 14b2 is spaced at a maximum distance c from the intake opening 10a of the sliver funnel. Air flows C and D enter the flow channel 15 directly and air flows E and F enter the flow channel 15 through the suction openings 151 and 152. The air flows C, D, E and F are removed by suction as air flow G by way of the suction pipe 14a through the flow channel 15 having the cover element 14b. According to Figs. 4a and 4b, the suction pipe 14a and the part 14b1 are arranged to pivot in the direction of arrows H and I by way of a holding element 19 on a fixed pivot bearing 20. According to Fig. 4a, the suction element 14a and the part 14b1 have been pivoted into the operational position. According to Fig. 4b, when not in operation the suction element 14a and part 14b1 are pivoted out in direction H, whilst part 14b2 remains fixed in position. As a result, the sliver funnel 10 and the draw-off rollers 8,9 are easily accessible for servicing and maintenance work. According to Fig. 5, the drawing system hood 21 has been pivoted open, the suction pipe 14a mounted on the drawing system hood 21 and the part 14b1 also having been pivoted away, so providing free access for maintenance and servicing. WE CLAIM 1. A device in a draw frame comprising a suction device for removing dust, fibre and the like, a sliver funnel (10) and a pair of draw-off rollers (8,9) are provided at an outlet of the draw frame immediately after a web- guiding element (7), the suction removal device (14) is enabled to encompass the region between the outlet (10b) of the sliver funnel (10) and the nip (a) between the draw-off rollers (8,9), characterized in that a flow channel (15) of the suction removal device (14; 14a, 14b) is arranged such that the flow channel (15) encompasses the intake region (10a) of the sliver funnel (10) and projects laterally beyond the intake region (10a) of the sliver funnel (10). 2. The device as claimed in claim 1, wherein the flow channel (15) is configured to overlap the intake region (10a) of the sliver funnel (10) and the nip (a) between the draw-off rollers (8, 9). 3. The device as claimed in claim 1 or claim 2, wherein the flow channel (15) is capable to pick-up the dust, short fibres and the like emerging from the intake (10a) and from the outlet (10b) of the sliver funnel (10). 4. The device as claimed in claim 1 or claim 3, wherein the suction removal device (14; 14a) having a cover element (14b) which partially covers the flow channel (15). 5. The device as claimed in any one of claims 1 to 4, wherein the cover element (14b; 14b1, 14b2) is in the form of a roof or the like. 6. The device as claimed in any one of claims 1 to 5, wherein the cover element (14b) is configured to overlap the intake region (10a) of the sliver funnel (10) and the nip (a) between the draw-off rollers (8, 9). 7. The device as claimed in any one of claims 1 to 6, wherein the flow channel (15), when viewed in the direction of fibre feed (B), is disposed upstream of the intake region (10a) of the sliver funnel (10). 8. The device as claimed in any one of claims 1 to 7, wherein a plurality of suction openings (151, 152), when viewed in the direction of fibre feed (B), are disposed upstream of the nip (a) between the draw-off rollers (8, 9). 9. The device as claimed in any one of claims 1 to 8, wherein the cover element (14b) is configured in two parts (141, 14b2). 10.The device as claimed in any one of claims 1 to 9, wherein the cover element (14b) surrounds a transfer pipe (17) associated with the sliver funnel (10). 11.The device as claimed in any one of claims 1 to 10, wherein the transfer pipe (17) passes through the flow channel (15). 12.The device as claimed in any one of claims 1 to 11, wherein the two parts (14b1, 14b2) of the cover element (14b) can be separated from one another. 13.The device as claimed in any one of claims 1 to 12, wherein the web- guiding element (7) and the transfer pipe (17) are positioned on a fixed- position part (14b2) of the cover element (14b). 14.The device as claimed in any one of claims 1 to 13, wherein the cover element (14b) comprises said fixed-position part (14b2) and a movable part (14b1). 15.The device as claimed in any one of claims 1 to 14, wherein the flow channel (15) is a cast piece, e.g. cast from aluminium. 16.The device as claimed in any one of claims 1 to 15, wherein the flow channel (15) has at least one opening (151, 152). 17.The device as claimed in any one of claims 1 to 16, wherein the at least one opening (151, 152) faces the nip (a) between the draw-off rollers (8, 9). 18.The device as claimed in any one of claims 1 to 17, wherein the flow channel (15) faces the intake region (10a) of the sliver funnel (10). 19. The device as claimed in any one of claims 1 to 18, wherein the flow channel (15) encompasses the intake region (10a) of the sliver funnel (10) and the nip (a) between the draw-off rollers (8,9). 20.The device as claimed in any one of claims 1 to 19, wherein the suction pipe (14a) of the suction removal device (14) is connected to a pneumatic suction source, e.g. mechanical suction. 21,The device as claimed in any one of claims 1 to 20, wherein the suction pipe (14a) and the movable part (14b1) are mounted to pivot (G, H) on a pivot bearing (20). 22.The device as claimed in any one of claims 1 to 21, wherein the suction pipe (14) and the movable part (14b1) are mounted on a pivotable drawing system hood (21). 23.The device as claimed in any one of claims 1 to 22, wherein the flow channel (15) and the sliver funnel (10) form a constructional unit 24.The device as claimed in any one of claims 1 to 23, wherein the flow channel (15) is integrated into the inlet (10a) of the sliver funnel (10). 25.The device as claimed in any one of claims 1 to 24, wherein the fixed- position part (14b2) of the cover element (14b) and the web-guiding- positioning element (7) form a functional unit. The invention relates to a device in a draw frame comprising a suction device for removing dust, fibre and the like, a sliver funnel (10) and a pair of draw-off rollers (8,9) are provided at an outlet of the draw frame immediately after a web-guiding element (7), the suction removal device (14) is enabled to encompass the region between the outlet (10b) of the sliver funnel (10) and the nip (a) between the draw-off rollers (8,9), characterized in that a flow channel (15) of the suction removal device (14; 14a, 14b) is arranged such that the flow channel (15) encompasses the intake region (10a) of the sliver funnel (10) and projects laterally beyond the intake region (10a) of the sliver funnel (10).

Documents:

549-KOL-2004-(07-12-2011)-FORM-27.pdf

549-KOL-2004-(13-08-2012)-FORM-27.pdf

549-kol-2004-abstract.pdf

549-kol-2004-claims.pdf

549-kol-2004-correspondence.pdf

549-kol-2004-description (complete).pdf

549-kol-2004-drawings.pdf

549-kol-2004-examination report.pdf

549-kol-2004-form 1.pdf

549-kol-2004-form 18.pdf

549-kol-2004-form 2.pdf

549-kol-2004-form 26.pdf

549-KOL-2004-FORM 27.pdf

549-kol-2004-form 3.pdf

549-kol-2004-form 5.pdf

549-kol-2004-granted-abstract.pdf

549-kol-2004-granted-claims.pdf

549-kol-2004-granted-correspondence.pdf

549-kol-2004-granted-description (complete).pdf

549-kol-2004-granted-examination report.pdf

549-kol-2004-granted-form 1.pdf

549-kol-2004-granted-form 18.pdf

549-kol-2004-granted-form 2.pdf

549-kol-2004-granted-form 26.pdf

549-kol-2004-granted-form 3.pdf

549-kol-2004-granted-form 5.pdf

549-kol-2004-granted-priority document.pdf

549-kol-2004-granted-reply to examination report.pdf

549-kol-2004-granted-specification.pdf

549-kol-2004-granted-translated copy of priority document.pdf

549-kol-2004-priority document.pdf

549-kol-2004-reply to examination report.pdf

549-kol-2004-specification.pdf

549-kol-2004-translated copy of priority document.pdf