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Publication numberUS3508342 A
Publication typeGrant
Publication dateApr 28, 1970
Filing dateApr 4, 1968
Priority dateApr 4, 1968
Publication numberUS 3508342 A, US 3508342A, US-A-3508342, US3508342 A, US3508342A
InventorsJohn Charles Britten, George Levtchouk
Original AssigneeMidland Ross Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Threading apparatus for web dryers
US 3508342 A
Abstract  available in
Previous page
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Claims  available in
Description  (OCR text may contain errors)




-THREAD ING APPARATUS FOR WEB DRYERS Filed April 4, 1968 s sheets-shed 2 INVENTORS.


ATTORNEY p l 1970 G. LEVTCHOUK ETAL 3,508,342


ATTORNEY United States Patent THREADING APPARATUS FOR WEB DRYERS George Levtchouk, Montreal West, Quebec, and John Charles Britten, Pincourt, Quebec, Canada, assignors to Midland-Ross Corporation, Cleveland, Ohio, a corporation of Ohio Filed Apr. 4, 1968, Ser. No. 718,714 Int. Cl. F26b 13/06 US. Cl. 34-120 9 Claims ABSTRACT OF THE DISCLOSURE The web tail holding clamp is a wedge type formed of, basically, two parts, a wedge over which the paper tail or pulp leader strip is placed and an immediately receiving complementary envelope, pocket or sleeve in which it is positioned. This combination is then threaded by conventional means through a conventional dryer having single or multi-passes.

This invention relates to a threading device for pulp or paper web dryers. More particularly, it relates to a simplified pulp or paper tail holder of the wedge type, that is adapted to hold the forward end of a pulp sheet (web) and be pulled through single or multiple pass dryers to start drying operations.

With increasing speeds and the tendency to totally enclose dryers and the like pulp and paper treatment apparatus, the threading up must be quickly positively, and automatically performed. The general conventional tape or rope threading means utilized to seize a web tail or leader strip by stitching it or side seizure and subsequent threading of a multilevel cylinder dryer or a single pass unit are not fully satisfactory in that upon not infrequent occasions the tail or leader holding section exerts unequal transverse tension beyond the cohesive strength of the wet pulp to tear away, necessitating additional threading attempts. The present means, advantageously, are designed in all instances to the pulp tail width and hold the tail or leader end over its transverse width firmly and with equal tension and positively throughout the thread ing-up operation. Specifically, the threading-up tail holding means comprises a generally V-shaped pocket or envelope and a generally V-shaped wedge fitting the pocket. The pulp tail is held by and between the two at the start of a threading operation, clamped therebetween, and the combined unit is led by means of a rope outrigger guide through a dryer. This is a sensitive operation in that the pulp is still heavy with ponsiderable moisture and must be pulled through one or more passes of some dryers having pass lengths varying of from about 30 to 140 feet long and may comprise as many as up to 13 or more passes.

The invention now will be described in greater detail with reference to the accompanying drawings, where:

FIGURE 1 is an elevation of a pulp drying apparatus, parts of it being in section, a plup web former, the threader, and this initial position of the envelope and Wedge pulp tail holder;

FIGURE 2 is a plan view of a part of the apparatus of FIGURE 1 ahead of the pulp feed;

FIGURE 3 is a perspective of the separate sections of the web or pulp tail holder;

FIGURE 4 is an elevation of the apparatus adapted to mount the pulp tail holder of FIGURE 3 in an operation position;

FIGURE 5 is a sectional detail of FIGURE 4 showing the simultaneous severing and seizing of a leader end or pulp tail;

FIGURE 6 is a further detail of FIGURE 5 showing the tab or leader holder unit being drawn away and into the dryer apparatus;

FIGURE 7 is a sectional detail of one manner of attachment of the separate components forming the pulp end holder, and their relative resting positions prior to the one nesting in the other taken on line 7-7 of FIGURE 4; and

FIGURE 8 is a further modification of FIGURE 7.

Referring to the drawing and to the general showing of a pulp drying apparatus in FIGURE 1 a web forming cylinder 9 under vacuum is adapted to mould and form a pulp web 10. The cylinder is positioned or immersed in a dilute solution of pulp stock 15 which adheres to the cylinder surface being drawn thereto by the vacuum applied to it from within (not shown) thus collecting thereon, as a fiber mat, a pulp web 10. The vat 13 is, of course, continuously replenished with a pulp solution. Expressed liquid continues to drop back into the main vat 13 as the pulp web 10 is compressed and consolidated in its advance about the cylinder by the rolls 16 pressing against its surface. The cylinder 9 rotates on its shaft 12 positioned in receiving bearings 11 located in the vat sides (not shown). The pressed pulp web 10 is then manually led away from the forming cylinder 9 placed under a couch roll 17 to and through press rolls .18 and on through the intervening threader apparatus of this invention. The aforesaid pulp web forming apparatus 9 is but one example of a pulp supply since, obviously, a pulp web also can be formed on and delivered by a Fourdrinier wire.

The wet pulp sheet 10 is initially hand manipulated being forwarded under the press rolls 16, then to and over an idler roll 29 where it is adjusted to a width re-' ceivable by the threader apparatus. As it is forwarded over the idler rolls 29, 19 and thence over a table or apparatus 20 (holding the threader unit it is cut along its sides by water jet 28 and led downwardly over a curved front section 21 of the table 20 between a further pair of complementary driven rolls 23 to waste. Since this invention is directed to a threading-up apparatus of a single or multi-pass dryer 48 the initial waste of the pulp sheet 10 end is of minimal account inasmuch as the forward portion is severed by a transverse positioned device 26 located within the table 20 and being actuated by a pneumatic or electrically powered motive means 25. The table 20 itself is portable and can be removed from its location once the dryer apparatus is threaded with the pulp supply.

The web 10, once started, is led onwardly through the press rolls 18 past the side trimming water jets 28, whose action narrows the Web by side sections 30 dropping as waste into bin 31 while it is supported by idler roll 29 to a width acceptable by the threader, at a rate that is coordinated with the dryer and the threader mechanism associated with it. The threader mechanism generally consists of an outrigger 47 (broadly shown in FIGURES l and 2) which is attached through the connecting line or rope 35 to a pulp web holding wedge 34 of the threader unit of FIGURE 3, the line or rope passing through side openings of the nesting envelope 33. A side trimmed pulp end 10 is then passed over the wedge 34 which upon being pulled subsequently nestles in the receiving cavity of the envelope 33, forming a tight web holding unit.

The wedge 34 is initially positioned in a recess 22 provided therefor in the portable table 20. At the proper time both the threader unit and the trimming knife 26 and the side trimming jets 28 are actuated and the outrigger 47 pulls the wedge 34 with the pulp Web passing over it into the waiting sleeve 33, securely clamping the pulp tail in between and hauling it toward the dryer 48. The wedge assembly is then pulled into the dryer complex 48 over the initial entry roll 46 (separated at the moment from its companion pressure roll) over the several interior dryer rolls 50 and thence out over exterior rolls 51 onto a subsequent collecting arbor or cutter and layboy (not shown). The threader rope 49, a steel tape in thisvinstance but it could easily be a rope, moves over sheaves 52 mounted on bearings (not shown) located on one end of the dryer rolls 50, 51, and external rolls 55 in an endless fashion, being circuitously mounted through the dryer as is generally known. Upon threading of the dryer apparatus 48 the web width trimmer jets 28 are stopped and moved aside and the threader apparatus is disengaged, the pressure drum of draw unit 46 at the entry end of the dryer is adjusted and the operation is restricted solely to that of feeding and the drying of the full width of the web roll 10 from the take-off point of the press rolls 18.

FIGURES 4-6 show in detail the nestled position of the pulp sheet holding wedge 34 in the indenture 22 in which the wedge 34 is positioned by being pulled by the companion pressure drive rolls 18 and 23. Of the latter rolls, one is driven by an endless belt 56 through a variable speed gear reduction unit 57 which, in turn, is driven by a power unit 58 through an endless belt 59. As stated hereinbefore, the speed of pulp web feed is correlated to that of the dryer 48 and to its threader apparatus. The table 20 is also provided with an apron 27 which deflects any moving pulp sheet into a guideway toward the pick-up and waste forwarding rolls 23. Further, advantageously there is provided an opposing recess 61 at about the foot of the apron 27, which serves as a receiving recess for the cut-off pulp trimming blade 26. The trimmer 26 is preferably covered, being provided with a shield 63. Upon a severing of the web 10 the blade 26 is at once retracted to its original position.

On either side of the wedge containing recess 22 and transversely opposing each other are substantially identical tapered side members or guides 36 over whose extending ends the sleeve or envelope 33 is initially positioned. It rests there until it is picked up by the Wedge 34 when pulled out of its cavity. As particularly shown in FIG- URES and 6, upon a starting signal, the web is forwarded to the threading-up unit being pull-pushed to the tensioning and take-up rolls 23. Immediately thereafter, while being held firm to the table surface 21, the knife 26 is actuated, severing the web 10 free of the rolls 23. The wedge 34 is immediately lifted from its resting position in the indenture 22 of the table raising the web 10 with it to wedge itself in the pocket or sleeve 33 which is then lifted or raised off the side guiding members 36: the pulling tape 35 moving through sleeve openings 41 then forms of the parts a unit which is pulled into and through the dryer apparatus 48. FIGURE 6 shows full engagement of the wedge 34 and its complementary receiving pocket or sleeve with the web 10 therebetween.

The wedging section 34 is jammed into the envelope 33 by means of the pulling strand 35 moving through transversely spaced sleeve openings 41 joining with the wedge at 42. Or, as in FIGURE 8, the end or returning section of the strand 35 can be passed about end positioned sheave 67 and tied into the sleeve as at 68. Upon a pull of the strand 35 the wedge 34 will be brought into the sleeve, the strand 35 moving through the openings 41 or 66 effecting a tight wedging of the pulp sheet. A continued pull on the strand 35 with the wedge in place in the sleeve will pull the unit off the side members 36 and through the dryer.

The wedge 34 itself further can be provided with a base support upon which it slides to be positively directly on its Way into the supported envelope 33. The base support or bottom guide 37 is shown in FIGURES 4 and 5 and can be a base plate of metal or rigid plastic secured to side plates 36. It is of such length only to prevent the wedge section 34 from not entering the sleeve section 33 and permit pressure of the pulp web tail or leader strip between wedge 34 and envelope 33.

The receiving envelope 33 as shown in FIGURE 3 is of a generally V-shaped construction. The envelope 33 has end closures 45 to fully cover the prepared tail section. It is adapted to quickly receive the complementary wedge member 34, whose narrow or forward end is strengthened by means of a rod 40, already having a pulp tail about it. Since the pulp tail is as wet as the remainder of the Web it must be dried also. The envelope 33 is desirably perforated as indicated in this figure and in FIGURES 7 and 8 as at 70 0f the drawings. Being perforated the drying medium can reach the wet pulp end in the sleeve to dry it and thus strengthen the forward end of the web. The inner Wedge itself can be perforated but it has been the experience that the perforated sleeve will suffice. Where the dryer is being threaded by the described apparatus and where it is of aluminum, or of other soft lightweight metal, and Where vibration or slack in the threading rope may cause the sleeve to come to rest on the surface of an air bed or on a dryer roll then to prevent scratching or in some manner damaging such surface, the sleeve 33 is provided with at least one plastic plate 39 on FIGURES 7, 4, 3 which serves as a runner or rubbing strip. Such a plate is provided on each side, in opposition. If necessary, more can 'be provided to assure greater safety from marring during passage. Of course, some plastics can be used for both the sleeve envelope and the wedge too. One such material can be Teflon, a marketed polymer of carbon tetrafluoride, since it can stand the high temperatures encountered in pulp drying. Another plastic could be a polyurethane polymer. It is necessary, however, to choose one that is tolerant to the high drying temperature to which the running pulp sheet is subjected. Further, for side support the envelope 33 also can be furnished with plastic wheels 69 as shown in FIGURE 8 to safeguard the surface of the rolls over which it will travel.

What is claimed is:

1. Apparatus for threading web treating apparatus wherein said treating apparatus is provided with guide means for mechanically threading a web therethrough, said guide means traveling in a path parallel to the normal path of said web from the entry to the exit of said treating apparatus, said web threading apparatus comprising, in combination: means for conveying the web through said web threading apparatus; means for trimming at least one longitudinal edge of said web to thereby form a tail of controlled width; a web holding device operatively associated with said guide means and having complementary parts through which the leading end of said tail is passed; means for actuating said guide means to pull said web holding means toward said treating apparatus and thereby actuate said holding means to wedge the leading end of said tail between the complementary parts thereof.

2. Apparatus according to claim 1 wherein said guide means comprises an endless rope disposed on one side of the normal web travel path during its passage through said web treating apparatus, and outrigger means afiixed to said rope and said web holding means.

3. Apparatus according to claim 2 wherein said endless rope comprises a steel tape which travels over sheaves located adjacent to the edge of each internal web treating roll.

4. Apparatus according to claim 1 wherein said trimming means comprises at least one Water jet positioned along the moving web for shearing off a predetermined portion from the side of said web, and further comprising means for severing the excess leading edge of said tail upon actuation of said web holding means.

5. Apparatus for threading Web treating apparatus wherein said treating apparatus is provided with guide means for mechanically threading a web therethrough, said guide means traveling in a path parallel to the normal path of said web from the entry to the exit of said treating apparatus, said web threading apparatus comprising, in combination: means for conveying the web through said Web threading apparatus; means for trimming at least one longitudinal edge of said web to thereby form a tail of controlled width, a web holding device operatively associated with said guide means and comprising a V- shaped envelope and a generally conforming wedge adapted to be positioned in said envelope, the leading end of said tail being adapted to be placed over the wedge; means for actuating said guide means to draw said Wedge into said envelope to thereby clamp the leading end of said tail therein.

6. Apparatus according to claim 5 wherein said guide means is operatively associated with said web holding device by passing over a pulley within said wedge and being firmly anchored at its extremity to said envelope.

7. A method for threading a Web treating apparatus wherein the "web is fed from a source of supply, through a threading machine and into treating apparatus and wherein the work is mechanically threaded through the treating apparatus comprising the steps of trimming at least one longitudinal edge of said web to thereby form a tail of controlled width; passing the leading end of said tail between complementary parts of a web holding device adapted to engage said tail by wedging action between said complementary parts; actuating a guiding and pulling means which is operatively associated with said web treating apparatus and said 'web holding device to thereby actuate the complementary parts of said holding References Cited UNITED STATES PATENTS 201,431 3/1878 Logue 24-45 2,944,345 7/1960 Faber 34120 2,946,619 7/1960 Wahl 24l26 3,085,346 4/1963 Allander 34120 FOREIGN PATENTS 1,016,301 8/1952 France.

EDWARD J. MICHAEL, Primary Examiner US. Cl. X.R.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US201431 *Aug 17, 1877Mar 19, 1878 Improvement in bale-ties
US2944345 *Jan 30, 1958Jul 12, 1960Time IncDrive mechanism for web threading apparatus
US2946619 *Sep 20, 1955Jul 26, 1960Electric Steel Foundry CoDouble socket and sling structure
US3085346 *Aug 26, 1959Apr 16, 1963Svenska Flaektfabriken AbThreading web material
FR1016301A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3643343 *Dec 22, 1969Feb 22, 1972Midland Ross CorpThreading a paper web in a web dryer
US4079877 *Jan 7, 1977Mar 21, 1978Midland-Ross CorporationWeb-dryer threading apparatus having anti-centrifugal structure
US4309830 *Mar 18, 1980Jan 12, 1982Vits Maschinenbau GmbhApparatus for threading a float web dryer
US4467950 *Aug 25, 1982Aug 28, 1984Flakt AbArrangement for pulling the tail of a web-like material through a drying or cooling plant
US5249373 *Sep 3, 1992Oct 5, 1993W. R. Grace & Co.-Conn.Web threading system
US5306393 *Jul 16, 1992Apr 26, 1994Huyck Licensco, Inc.Method for installing a fabric in a paper machine
US5429719 *Sep 9, 1993Jul 4, 1995Huyck Licensco, Inc.Self-aligning dryer fabric loading harness
US6425513Jun 9, 1998Jul 30, 2002Voith Sulzer Papiermaschinen GmbhDevice and method for transferring a threading strip or a material strip
US8435383 *Mar 7, 2012May 7, 2013Edwin X GrafProcess and machine for making air dried tissue
US20120160440 *Mar 7, 2012Jun 28, 2012Graf Edwin XProcess and machine for making air dried tissue
DE19724123A1 *Jun 9, 1997Dec 10, 1998Voith Sulzer Papiermasch GmbhVorrichtung und Verfahren zum Überführen eines Einfädelstreifens oder einer Materialbahn
U.S. Classification34/120, 226/12, 24/196, 162/255
International ClassificationD21F7/04
Cooperative ClassificationD21F7/04
European ClassificationD21F7/04
Legal Events
Sep 29, 1989ASAssignment
Effective date: 19841204
Dec 19, 1984AS02Assignment of assignor's interest
Effective date: 19841204
Dec 19, 1984ASAssignment
Effective date: 19841204