US 3740312 A
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Description (OCR text may contain errors)
June 19, 1973 D. c. CRONIN 3,740,312
STRUCTURE FOR THREADING PAPERMACHINE Filed Oct. 1, 1971 IN vim-"mu, Q, Dav/W5 C [kc/w United States Patent Office U.s. C1. 162--306 11 Claims ABSTRACT OF THE DISCLOSURE A device for threading a paper machine which includes a pair of closed loop carrier members mounted on a series of supporting rolls and arranged in such a way that a paper web may be transferred from one of the carriers to the' other. One of the carriers may take the form of a moving wire onto which a paper web or the like is placed. The web and the wire then move continuously together until the combination of wire and web come in contact with the second carrier which may be made of felt or other similar fluid absorbent material. The two closed carrier loops are moved into proximity with one another such that the paper web traveling along with the first carrier may be readily transferred to the second carrier and moved onward to further machine processing stages. The felt carrier is provided with a roll which is rotatably mounted and which urges the felt carrier into contact with the wire carrier. The wire carrier has a roll which is rotatably mounted on a pivot arm which may be pivoted to move the associated wire carrier into and out of proximity with the adjacent felt carrier. The pivotally mounted roll is supported radially inwardly of the loop formed by the associated wire carrier such that pivotal movement of the roll will attempt to slacken the loop. A further roll is mounted exteriorly of the loop in such a way as to take up the slack which is developed by the pivotal action of the pivotally mounted roll.
BACKGROUND OF THE INVENTION The field of art to which this invention pertains is paper machines and in particular to means for threading a paper web or the like from a first moving wire carrier to a second carrier.
It is a principal feature of the present invention to provide an improved apparatus for threading a paper machine.
1 It is another feature of the present invention to provide an improved means for transferring the path of a moving web from a first web carrier to a second independent carrier.
It is an important object of the present invention to provide an improved structure for threading a moving paper web or the like between a pair of adjacent rolls associated with independent web carrier structures.
It is also an object of the present invention to provide a device for threading a paper machine which includes a pair of carrier loops wherein each of the carriers have at least one roll for urging the carrier into proximity with the opposing carrier loop to enable the transfer of a moving web from one of the carriers to the other, and hence to a further machine operation stage.
It is another object of the present invention to provide a wire carrier for a paper web having a pivotally mounted roll for urging a portion of the wire carrier and its associated paper web or the like into proximity with a felt or water absorbent carrier.
It is an additional object of the present invention to provide a threading device for a paper machine as described above wherein the pivotally mounted roll is supported radially interiorly of the associated carrier loop such that the loop would normally tend to slacken as the roll is pivoted about its pivot point.
3,740,312 Patented June 19, 1973 It is another object of the present invention to provide a paper threading device as described above wherein a further roll is provided exteriorly of the wire carrier to take up slack which would otherwise be created in the carrier as the pivotally mounted roll is moved from one position to another.
It is still another object of the present invention to provide a device for threading a paper machine which includes means for altering the configuration of a closed wire carrier loop by means of a pivotally mounted roll wherein the roll is provided with an extension arm and wherein the extension arm is pivotally supported radially interiorly of the associated closed carrier loop to allow for maximum swing of the roll during pivotal movement of the extension arm.
These and other objects, features and advantages of the present invention will be understood from the following description and the associated drawing wherein reference numerals are utilized to designate an illustrative embodiment.
BRIEF DESCRIPTION OF THE DRAWING The single drawing of the present invention is a schematic illustration of a portion of a paper machine according to the present invention and illustrates in detail the presence of the separate or independent carrier loops and the means for transferring a paper web from one of the carriers to the other carrier and particularly illustrating in detail the pivotally mounted roll for altering the configuration of one of the carrier loops in order to engage and disengage the two carriers from a contacting relationship with each other.
DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the present invention, a paper web is formed on a moving wire carrier. The carrier itself moves in a continuous closed path, and the paper web moves from the first carrier to a further carrier and from that point to subsequent machine operation stages. The second carrier which is formed of felt or other fluid absorbent material is also moved in a continuous closed loop, and the loops of the two carriers are moved into proximity with each other by means of properly positioned rolls. The felt carrier has a roll known as the pickup roll which moves a portion of the felt carrier into proximity with the wire carrier. The wire carrier has a pivotally mounted roll which alters the configuration of the closed wire loop to move the wire carrier into and out of engagement with the felt carrier. This allows the paper web which is initially supported on the wire carrier to be fed between the wire carrier and the felt carrier at the point of engagement of the two. Of course, adjustment of one of the supporting rolls of a closed loop tends to either increase or decrease the slack in the closed carrier. Accordingly, an additional roll is provided about which the configuration of the wire carrier loop may be altered without developing slack.
The drawing of the present invention has been greatly simplified for the purpose of explanation. The various means, of course, to support the rolls are well known in the art and need not be described in detail. It is understood that the rolls indicated in the schematic drawing of the present application are generally of a substantial size having a length which is much greater than their respective diameters.
Referring to the drawing in detail, a source of pulp solution or other material is indicated generally by the reference numeral 10. The viscous material is fed through an outlet 11 to a space 12 which is formed between an outer looped forming wire 13 and a Fourdrinier forming carrier wire 14. The forming wire 13 moves over and around a roll 15 as shown at 16 and beneath a larger forming breast roll 17 commonly known as a breast roll. The wire 13 then passes over a further roll 18 as at 19. The looped Fourdrinier wire 14 is preferably of a light plastic woven wire.
The web of material is formed between the forming wire 13 and the wire which, as shown in the drawing, moves in a continuous loop. Both the outer wire and the Fourdrinier carrier Wire pass together around the breast roll 17, and at the point 20, the carrier Wire 14 and the outer wire 13 diverge with the web W traveling along with the Fourdrinier wire 14 to a subsequent machine operation stage.
During the web forming stage just described, water thrown through the wire 13 is retained in a saveall pan 21. Also, water may be taken inwardly of the porous breast roll 17 through suction applied at the center thereof. For this purpose, the forming roll 17 may have a porous surface to allow the pulp solution to be drawn inwardly therethrough into a suction gland 17a.
The combination of the wire 14 and the web W then moves in a direction indicated generally by the arrow 22 past a suction box 23 or other drainage means. The suction box 23 assists in removing additional water through the wire 14 and thereby assists in the proper formation of a uniform web on the traveling wire.
The wire 14 and its associated web then pass over a guide roller 24 within the wire loop. A guide roller 25 is provided outside the wire loop, and the combination of the guide rollers 24 and 25 maintain the general configuration of the wire loop during the pivotal action of the pivot couch roll 26 of the present invention. This tension in the wire 14 will remain so it can keep traveling at relatively high speed even when the couch roll 26 is dropped.
The pivot couch roll of the present invention is indicated generally by the reference numeral 26 and is provided with an extension arm 27 which supports the roll on the axis 28 at a pivotal mount 29. As shown, the pivotal mount 29 is disposed radially inwardly of the closed loop formed by the wire 14. The wire 14 passes around the exterior of the roll 26 and beneath the roll 25 as shown in the drawing.
The dotted line illustrates the alternate down or dump position of the pivotal roll 26. The roll 26 is moved to the dump position with breakage of the web or on occasion when the web is to be dumped into the broke pit. When the roll 26 is pivoted to the down position, the wire 14 passes around the rolls 24 and 25 such that the wire 14 does not lose substantial slack during the pivotal operation. A suitable power operator such as an air cylinder is provided for pivoting roll 26.
As will be understood, the paper web leaves the wire 14 at the point 30, and the wire -14 continues around the exterior of the roll 26 and beneath the roll 25 to the point 31 where it passes between a roll 32 and a grooved roll 33. The combination of these rolls removes excess fluid which is remaining on the wire. Excess fluid is then captured in a basin or other similar container 34. The wire 14 then moves past a subsequent roll 35 and returns to its starting position against the Fourdrinier wire 13 and the surface of the breast roll 17. As shown, a doctor blade 36 is provided in conjunction with the roll 35 to remove excess fluid from the roll surface which may gather thereon from the wire and which has escaped removal prior to that point. The functioning of the doctor blade 36 and a further doctor blade 37 which is similarly associated with a roll 25 is well understood in the art.
The wire 14 passes against a felt 38 which also moves in a continuous and closed loop as shown in the drawing. The felt carrier passes around the outside surface of a pickup roll 39. The perforate pickup roll 39 has a suction gland 39a therein. A doctor blade 40 is associated with the pickup roll 39. A catch pan or basin 41 is provided beneath the doctor blade 40 to receive fluid therefrom in a well understood manner,
The felt carrier 38 then passes against a drum 42 commonly referred to as a Yankee drier. At the point 43, the paper web or the like separates from the wire carrier and moves along the surface of the drum to be properly dried and further processed. A grooved roll 44 is provided to establish a nip with the Yankee drier 42 and to remove excess fluid from the felt carrier. A catchall pan or basin 45 similar to the pans 34 and 41 is provided to receive excess fiuid from the grooved roll 44. The felt carrier 38 then passes against a series of guide rollers 46, 47 and 48 and finally passes between a pair of rollers 49 and 50. The roller 50 is also a grooved roll and is similar to the grooved rolls 33 and 44 and functions in the same manner. A saveall pan 51 is also provided to retain fluid which is removed at the grooved roll 50.
In summary, the structure of the invention may be set forth in terms relating to a paper making machine as inincluding a traveling wire 14 supported in a continuous loop, with means for forming a web of material on the wire including the slice 11 and the breast roll 11 with the wire and web moving together along the upper forming run which encompasses a portion of the loop traveled by the wire. The structure further includes a traveling fluid absorbent type carrier or felt 38 which is supported in a second continuous loop and has means including the pick up roll 39 for causing the web to move together with the felt along a portion of its loop. The structure further has roll means associated with each of the loops urging the two carriers 14 and 38 into proximity with each other, which rolls include the pickup roll 39 and the couch roll 29. The couch roll is pivotally mounted to urge the wire 14 into proximity with the felt 38 or to move it away from the felt.
Therefore, an apparatus is provided which utilizes a pair of carrier loops disposed in such a way to be in proximity with each other and which utilizes a pivotally mounted roll supported radially inwardly of one of the carriers in such a way as to alter the loop configuration and allow for threading of the paper or other web-like material between the adjacent surfaces of the two carriers.
I claim as my invention:
1. A device for threading a moving web of material from a first carrier to a second carrier comprising:
a first roll,
means of continually moving said first carrier against the surface of said first roll,
a second roll having an axis which is movable relative to the axis of said first roll and being positioned immediately adjacent to said first roll,
means for translating the axis of said second roll in such a manner as to move the surface of said second roll toward and away from the surface of said first roll,
said first and second carriers passing between said first and second rolls during the respective movements thereof,
means for maintaining a web of material against said second carrier prior to the movement thereof between said first and second rolls, and means for maintaining said web of material against said first carrier after the movement thereof between said first and second rolls.
2. A device in accordance with claim 1 wherein said second roll is pivotally supported relative to said first roll allowing said first carrier to be moved into and out of engagement with said second carrier in dependence on the pivotal position of said first roll.
3. A device in accordance with claim 2 wherein said second roll has an extension arm supporting the same and wherein said extension arm has a pivotal support allowing said second roll to pivot relative to said first roll.
4. In a web forming apparatus,
first and second carriers,
a plurality of rolls supporting each of said first and second carriers in independent closed paths,
one of said rolls associated with supporting said first carrier and another of said rolls associated with supporting said second carrier urging a portion of each of said closed carriers into proximity with each other,
said one roll being rotatably mounted and maintaining its associated carrier in a relatively fixed configuration, and
said second roll being rotatably mounted and being movably supported to alter the configuration of its associated carrier for moving the same into and out of proximity with the carrier path of said one roll.
5. A device in accordance with claim 4 wherein said second roll is pivotally supported and shifts the configuration of its carrier path into and out of proximity with the opposing carrier during pivotal movement thereof.
6. A device in accordance with claim 5 wherein said second roll is pivotally supported inwardly of the closed carrier path associated therewith.
7. A device in accordance with claim 6 wherein a further roll is provided adjacent to the carrier path associated with said pivotal second roll and wherein said further roll is positioned to take up slack in the carrier path during pivotal movement of said second roll.
8. In a web forming apparatus,
a traveling wire carrier supported in a continuous loop,
means for forming a web of material on said wire and moving the wire and web together along a portion of the loop traveled by said wire,
a traveling fluid absorbent type carrier supported in a second continuous loop and means for causing the web of material to move together with said fluid absorbent carrier along a portion of the loop traveled by the same,
roll means associated with each of said loops and urging the two carriers into proximity with each other, and
one of said roll means being pivotally mounted to urge a portion of one of said loops into and out of proximity with the other of said loops.
9. A device in accordance with claim 8 wherein said one roll means is supported radially inwardly of its associated loop such that pivotal movement thereof tends to slacken said loop.
10. A device in accordance with claim 9 wherein a further roll is provided radially outwardly of the loop associated with said one roll and wherein said further roll is positioned to take up slack in said loop during pivotal movement of said one roll.
11. In a web forming apparatus the combination comprising,
a traveling looped continuous forming wire,
means for forming and dewatering a web on the wire,
a couch roll positioned within the wire and movable between a first normally operating position and a second dump position,
a pickup roll associated with the wire for removing the web from the wire adjacent the couch roll, and support rolls for the wire positioned so that the wire will remain taut in both positions so that the wire can continue traveling when the couch roll is moved to the down position to dump the web into a broke pit.
References Cited UNITED STATES PATENTS 2,622,492 12/1952 Goodwillie 226-91 X 3,207,658 9/1965 Lamb 22691 UX 3,595,745 7/1971 Cronin 226-9l UX RICHARD A. SCHACHER, Primary Examiner G. A. CHURCH, Assistant Examiner US. Cl. X.R. 226-91 FORM PO-1050(10-69) UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 5,7 ,5 Dated June 9, 975
Inven Dennis C. Cronin It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:
Column i, line 57, "second" should read first line 59, "first" should read second line 67, "first" should read second Signed and Sealed this ninth D ay Of September 1975 [SEAL] Attesl:
RUTH C. MASON Arresting Officer C. MARSHALL DANN (ummissiimer ufParents and Trademurkx USCOMM-DC 60376-P69 u.s GOVERNMENT PRINTING OFFICE: 369 930