US3142588A - Coater rope threading device - Google Patents

Description

July 28, 1964 J. PHILLIPS COATER ROPE mamomc DEVICE 3 Sheets-Sheet 1 Filed Dec. 22, 1961 5 INVENTOR. frVz'it ATTORNEYS y 28, 1954 I J. PHILLIIPS 3,142,598

v COATER ROPE Tl-IREADING DEVICE Filed Dec. 22, 1951 I5 Sheets-Sheet 2 INVENTOR. [71/172 J. P/i/Kf;

July 28, 1964 l. J. PHILLIPS COATER ROPE THREADING DEVICE 3 Sheets-Sheet S Filed Dec. 22, 1951 A TTORNEYS United States Patent 3,142,588 COA'IER RQPE T ADHNG DEVICE Irvin J. Phillips, South Beloit, 111., assignor to Beloit liron Works, Beloit, Win, a corporation of Wisconsin Filed Dec. 22, 1961, Ser. No. 161,671 11 Claims. (1. 1184ll7) The present invention relates to improvements in paper machines and particularly to an improved mechanism utilizing ropes for carrying the lead strip of a moving paper sheet through a machine and around rolls in order to thread the lead end of a fresh web into the machine.

For starting a paper machine with a fresh paper Web or for rethreading the Web through the machine after a break, a lead strip is formed or attached on the lead end of the paper web and passed over the rolls at the various stations. This is usually accomplished by inserting the lead strip in the nip of a pair of adjacent bands or ropes known as Sheahan ropes, which usually extend through a path beside the rolls parallel to the path of the paper web. The ropes are driven at the speed of the surface rotation of the rolls and the lead strip will draw the Web over the rolls to thread it through the machine.

In some structures it is difficult to accommodate sheaves for supporting the threading ropes since they interfere with the position of other machine elements. For reliable operation particularly at high speeds the ropes should follow the contour of the rolls and lead the strip around the roll surfaces. Therefore the supporting sheaves should be positioned adjacent the ends of the rolls. One structure which has been found to present such a problem is a puddle coater having an end dam for retaining a puddle of coating liquid above the coating doctor blade, which projects past the roll end and normally interferes with the eflicient and necessary operation position of rope carrying sheaves. For effective operation a rope threading system must be provided wherein the ropes operate continuously, since rethreading must occur as soon as possible if a break occurs in the travelling paper web to avoid periods of operation without a web travelling through the machine, which are costly and which can damage moving parts. The present invention contemplates the provision of rope sheaves for continuous rope operation which can shift out of the way of operating parts, and can shift into optimum threading position when the parts are out of the way.

An object of the invention is to provide an improved rope rethreading mechanism for a machine having rolls over which the lead end of a web must be threaded wherein the ropes operate continuously and do not interfere with the presence of other elements, but yet can be positioned in an optimum location for threading operation.

A still further object of the invention is to provide an improved system of sheaves for carrying threading ropes in a mechanism such as a paper machine wherein certain sheaves can function in different running positions to accommodate the presence of other operating parts.

A still further object of the invention is to provide an improved paper coating mechanism employing a puddle coater wherein a coating end dam projects past the end of a backup roll and wherein the coating mechanism is provided with a rope rethreading mechanism for threading a lead strip over the backup roll.

A feature of the invention is the provision of a puddle coating mechanism employing a backup roll with a doctor blade and an end dam wherein the end dam is movable between an operating position adjacent the end of the backup roll and a rest position away from the backup roll, and threading rope carrying sheaves are provided with one set of sheaves being movable between a first running "too position wherein the threading rope is supported and fed to a second set of stationarily positioned sheaves, and a second running position wherein both sets of sheaves are in optimum position for threading the lead strip of a fresh web over the surface of the backup roll.

Other objects, advantages and features will become more apparent with the teaching of the principles of the invention in connection with the disclosure of the preferred embodiment in the specification, claims and drawings, in which:

FIGURE 1 is an end elevational view shown somewhat in schematic form of a paper coating machine section embodying the principles of the present invention;

FIGURE 2 is a fragmentary plan view of an end darn at the end of a doctor blade for the mechanism;

FIGURE 3 is an end elevational view similar to FIG- URE 1 but showing a set of rope carrying sheaves in shifted position and with the end dams omitted; and

FIGURE 4 is a side elevational view of the mechanism taken from the right side of the structure as shown in FIGURE 1.

As shown on the drawings:

FIGURES 1, 3 and 4 illustrate a puddle coating mechanism such as may be found in a section of a paper making machine or such as may be employed in a converting mechanism for converting paper. It will of course be understood that the principles of the invention permit utilization in other environments and the invention is disclosed in connection with a coater for a travelling web of paper inasmuch as it is particularly well adapted to this use.

A travelling paper web W passes over the surface of a rotating cylindrical backup roll 10 to receive a layer of coating on the outer surface. The backup roll is supported on end bearings 11 mounted on a machine frame 12.

A coating doctor blade 13 engages the outer surface of the web at a trailing angle and a puddle of coating is maintained above the blade being supplied by a suitable coating supply device, not shown. The coating blade is supported in a doctor back 14 which is pivotally supported at its ends in bearings 15.

The doctor blade 13 is shown in FIGURE 1 in a close running position relative to the outer surface of the web W, and may be loaded thereagainst or held with a very slight gap with respect to the web surface, and is shown in FIGURE 3 in a rest position away from the outer surface of the backup roll 10. The mechanism for supporting and moving the doctor blade 13 is similar to that disclosed in the copending application of Irvin J. Phillips, filed December 22, 1961, Serial No. 161,670.

Briefly, the mechanism for positioning and loading the doctor blade 13 incorporates a fluid cylinder 16 with a piston slidable therein connected to a piston rod 1'7 which is pivotally connected to the doctor back. Admission of air into the lower end of the cylinder 16 moves the blade toward close running position and release of air from the lower end permits the blade to drop downwardly to rest position. Additional mechanism may be incorporated for more closely controlling the blade loading pressure and for supporting the weight of the doctor back and associated mechanism. The operating position of the blade 13 is controlled by a micrometer 18 connected to and carried with the doctor back 14 and movable against the surface of a stop 19 which is fixed on the machine as part of the end column 211 which supports the bearing 15. Adjustment of the micrometer 18 will vary the position and pressure of the doctor blade 13.

At each end of the doctor blade 13 is an end dam such as the end dam 21. The end dams have a gasket 22 at their lower edge to form a seal with the doctor back 14 S to retain the puddle of liquid coating above the blade 13.

The end dam 21 is illustrated as incorporating a vertical plate, FIGURES l and 2, supported on an arm 21a which is pivotally mounted on brackets 23 and 24 mounted on the side of the stationary bearing column 20. The end dam is provided with a drain opening 25 for excess coating material.

The arm 21a is pivotally sup orted between the brackets 23 and 24 by a pivot pin 29. and a rigid locking arm 28 extends between the brackets 23 and has a vertical bore 27 for receiving a locking pin 26 which drops down through openings, also shown at 27 in the brackets 23 and 24 to lock the end darn 21 in operating solid line position of FIGURES 1 and 2. By lifting the locking pin 26 out of the holes 27, the locking arm 28 is free, and the end darn can be swung to the dotted line rest position. As will be noted, in the solid line position the end dam projects alongside the end of the backup roll 19, and in the dotted line position it is pivoted away from the end of the backup roll. The end dam 21 has been omitted from FIGURE 3 for clarity of the drawing, but it will be in the dotted line position shown in FIGURE 2, away from the roll 10.

For threading the lead end of a fresh web over the backup roll 10, threading ropes R are provided, and these ropes are of a known structure being run in pairs over sheaves positioned at convenient locations through the machine. The ropes are formed in continuous endless bands and operate continuously with the machine at the speed of the periphery of the rolls, so that upon breakage of the web an alert operator can quickly throw a lead strip between the ropes to draw the lead broken end of the web through the machine to rethread it.

Sheaves for guiding a lead strip around the backup roll 10 are shown in a first set of sheaves 31 rotatably supported on a bracket for rotation about an axis parallel to the backup roll 10. The bracket 30 is secured to an arm 32 pivotally journalled on an annular bearing track 32a on the backup roll bearing housing 11. In the uppermost position of the first set of sheaves 31, as shown in FIGURE 1, the lowermost sheave 31 may provide the sole support for the ropes R and at least provides a guide for the ropes travelling down to a second stationary set of sheaves 34 rotatably mounted on a bracket 33. The sheaves 31 in their uppermost or first running position are positioned alongside the backup roll and movable in an arc of travel coaxial with the backup roll to a second running position, FIGURE 3, wherein the outer tangent points of each of the sheaves, where they support the backup ropes R, provide a substantially arcuate path of travel concentric with the backup roll for an optimum path for threading the lead strip of a fresh web.

The first set of sheaves 31 is shown shifted to the second running position in FIGURE 3 where they are spaced from the second set of sheaves 34 a distance substantially equal to the spacing between the sheaves of each set.

Movement of the first set of sheaves 31 from the first running position of FIGURE 1 to the second running position of FIGURE 3 is accomplished by an arm 36 which is connected to the journal of the arm 32 and which also is connected to a piston rod 37 of a piston slidable within a cylinder 38 mounted on the frame 12. The cylinder is provided with suitable air openings and at the time when rethreading is to occur the piston rod 37 is extended to shift the first set of sheaves 31 down to the second running position of FIGURE 3. Just before this, the doctor blade 13 will be dropped down to the rest position, and the end dam 21 will be swung out of the way to its dotted line rest position of FIGURE 2.

In brief summary of operation, when rethreading is to occur such as when a break is encountered, the doctor blade is dropped down to the rest position of FIGURE 3 and the end dam is swung outwardly to the rest position by removal of the locking pin 26, and the sheaves 31 are swung down to the second running or rethreading posi- Cit tion of FIGURE 3. This can be accomplished during travel of the ropes and without interference thereof, and continued operation and support of the ropes will continue. After threading has been accomplished, the sheaves 3-1 are swung up to the first running position of FIG- URE 1 so that the doctor blade 13 and end dam 21 can be moved back to their operative positions.

Thus it will be seen that I have provided an improved mechanism for rethreading a paper web which meets the objectives, advantages and features above set forth. The mechanism is capable of operating continuously at high running speeds without attention and adjustment, and permits the threading of the ropes to operate continuously and yet be positioned for optimum threading without interference with the normal operation and presence of other parts.

The drawings and specification present a detailed disclosure of the preferred embodiments of the invention, and it is to be understood that the invention is not limited to the specific forms disclosed, but covers all modifications, changes and alternative constructions and methods falling within the scope of the principles taught by the invention.

I claim as my invention:

1. In a machine for accommodating a continuous travelling web, the combination comprising a web carrying roll for supporting the travelling web, operating mechanism movable from an operating position to a rest position relative to said roll, a sheave means for supporting carrier ropes to take the lead end of a web over the roll for threading a fresh web, a mount for said sheave means accommodating movement from a first running position to a second running position, said second position located to take the web over said roll, and means for moving said sheave means to said second position for threading the end of the fresh web during a period when said operating mechanism is in rest position.

2. In a machine having a continuous travelling web, the combination comprising a web carrying roll for supporting the travelling web, operating mechanism movable from an operating position close to the roll to a rest position, a sheave means for supporting carrier ropes to take the lead end of a web over the roll for threading a fresh web, a mount for said sheave means accommodating movement from a first running position to a second running position, said second position located to take the web over said roll, and means for moving said sheave means to said second position to thread a web during a period when said operating mechanism is in rest position.

3. In a paper machine having rolls for carrying a moving paper web, the combination comprising a backup roll, a blade mechanism for applying a coating doctor blade to the moving web on the backup roll, means for moving the mechanism between a running position and a rest position, threading sheaves supported at the end of the backup roll for supporting carrier ropes, and means for moving said threading sheaves from a first running position where the ropes are supported out of interfering relationship with the blade mechanism in its running position, to a second running position after the blade mechanism is moved to said rest position.

4. In a machine having a continuous travelling web, the combination comprising a web carrying roll for sup porting the travelling web, operating mechanism movable from an operating position to a rest position relative to said roll, a sheave rotatable about an axis parallel to said roll for supporting carrier ropes to take the lead end of the web over the roll for threading a fresh web, a pivotal mount for said sheave accommodating movement from a first running position to a second running position, said second position located to take the web over said roll, and means for pivotally moving said sheave on said mount to said second position during a period when said operating mechanism is in rest position.

5. In a machine having a continuous travelling web,

the combination comprising a web carrying roll for supporting the travelling web, operating mechanism movable from an operating position to a rest position relative to said roll, a sheave rotatable about an axis parallel to said roll for supporting carrier ropes to take the lead end of the web over the roll for threading a fresh web, a pivotal mount for said sheave coaxial with said roll accommodating movement from a first running position to a second running position, said second position located to take the web over said roll, and means for pivotally moving said sheave on said mount to said second position during a period when said operating mechanism is in rest position.

6. In a machine having a continuous travelling web, the combination comprising a web carrying roll for supporting the travelling web, a sheave rotatable about an axis parallel to said roll for supporting carrier ropes to take the lead end of the Web over the roll for threading a fresh web, a pivotal mount for said sheave coaxial with said roll accommodating movement from a first running position to a second running position, said second position located to take the web over said roll, and an air cylinder connected to said mount for pivotally shifting the position of said sheave to said second position.

7. In a machine having a continuous travelling web, the combination comprising a web carrying roll for supporting the travelling web, operating mechanism movable from an operating position to a rest position relative to said roll, first and second sheave means having sheaves rotatable about an axis parallel to said roll for supporting carrier ropes to take the lead end of a web over the roll, a mount for said first sheave means accommodating movement from a first running position to a second running position, said second position locating the carrier ropes to carry a web over said roll, a fixed mount for said second sheave means locating said second sheave means for supporting the carrier ropes in both positions of said first sheave means, and means for moving said first sheave means to said second position to thread the web over the roll during a period when said operating mechanism is in rest position.

8. In a paper machine having rolls for carrying a moving paper web, a backup roll, a blade mechanism for applying a coating doctor blade to the moving web on the backup roll including an end dam for holding a puddle of coating on the blade, a support for the end dam accommodating movement from an operating position adjacent the roll to a rest position, sheave means supported at the end of the roll for carrier ropes, a mount for the sheave means accommodating movement from a first running position to a second running position, said second position located to thread the lead end of a web over the roll, said operating position of the end dam and said second position of the sheave means being located so that intereference exists, and operating means connected to said mount so that the sheave means can be moved to said second position after the end dam is moved to rest position.

9. In a paper machine having rolls for carrying a moving paper web, a backup roll, a blade mechanism for applying a coating doctor blade to the moving web on the backup roll including an end dam for holding a puddle of coating on the blade, a support for the end (lam accommodating movement from an operating position adjacent the roll to a rest position, sheave means supported at the end of the roll for carrier ropes, a mount for the sheave means accommodating movement from a first running position to a second running position, said second position located to thread the lead end of a web over the roll, said operating position of the end dam and said second position of the sheave means being located adjacent the end of the roll substantially at the periphery, and operating means connected to said mount so that the sheave means can be moved to said second position after the end dam is moved to rest position.

10. In a paper machine having rolls for carrying a moving paper web, the combination comprising a backup roll, a blade mechanism for applying a coating doctor blade to the moving web on the backup roll including a support for carrying the blade from an operating position against the Web to a rest position away from the web, and including an end dam coacting with the blade in an operating position adjacent the end of the roll to hold a puddle of coating on the blade, a pivotal mount for the end dam accommodating movement to a rest position away from the roll, sheave means supported at the end of the roll for carrier ropes including a plurality of suc cessive sheaves rotatably supported on axes parallel with the roll, a pivotal mount for the sheave means accommodating movement from a first running position to a second running position, said second position located to thread the lead end of a Web around the roll, said operating posi tion of the end dam and said second position of the sheave means being located so that interference exists, and operating means connected to said mount so that the sheave means can be moved to said second position after the end dam is moved to rest position.

11. In a paper machine having rolls for carrying a moving paper web, the combination comprising a backup roll, a blade mechanism for applying a coating doctor blade to the moving web on the backup roll including a support for carrying the blade from an operating position against the web to a rest position away from the web and including an end dam coacting with the blade in an operating position adjacent the end of the roll to hold a puddle of coating on the blade, a pivotal mount for the end dam accommodating movement to a rest position away from the roll, a first sheave means supported at the end of the roll for carrier ropes, a mount for the sheave means accommodating movement from a first running position to a second running position, said second position located to thread the lead end of a web over the roll, said operating position of the end dam and said second position of the sheave means being located so that interference exists, operating means connected to said mount so that the first sheave means can be moved to said second position after the end dam is moved to rest position, and a second fixed sheave means including a plurality of successive sheaves positioned to carry ropes threaded over said first sheave means in both positions of said first sheave means.

Kremer Mar. 14, 1916 Pearson Nov. 7, 1950

Claims (1)

1. IN A MACHINE FOR ACCOMMODATING A CONTINUOUS TRAVELLING WEB, THE COMBINATION COMPRISING A WEB CARRYING ROLL FOR SUPPORTING THE TRAVELING WEB, OPERATING MECHANISM MOVABLE FROM AN OPERATING POSITION TO A REST POSITION RELATIVE TO SAID ROLL, A SHEAVE MEANS FOR SUPPORTING CARRIER ROPERS TO TAKE THE LEAD END OF A WEB OVER THE ROLL FOR THREADING A FRESH WEB, A MOUNT FOR A SAID SHEAVE MEANS ACCOMMODATING MOVEMENT FROM A FIRST RUNNING POSITION TO A SECOND RUNNING POSITION, SAID SECOND POSITION LOCATED TO TAKE THE WEB OVER SAID ROLL, AND MEANS FOR MOVING SAID SHEAVE MEANS TO SAID SECOND POSITION FOR THREADING THE END OF THE FRESH WEB DURING A PERIOD WHEN SAID OPERATING MECHANISM IS IN REST POSITION.

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