US3359843A - Blade adjusting mechanisms for rotary paper cutters - Google Patents

Description

G. A. MEAD Dec. 26, 1967 BLADE ADJUSTING MECHANISMS FOR ROTARY PAPER CUTTERS 4 Sheets-Sheet 1 Filed May 5, 1966 FlG INVENTOR GILE A. MEAD ATTORNEYS Dec. 26, 1967 cs. A. MEAD I 3,359,843

BLADEADJUSTING MECHANISMS FOR ROTARY PAPER CUTTERS Filed May 5, 1966 4 Sheets-Sheet 2 GILE A. MEAD INVENTOR,

ATTORNEYS G. A. MEAD Dec. 26, 1967 BLADE ADJUSTING MECHANISMS FOR ROTARY PAPER CUTTERS Filed May 5, 1966 4 Sheets-Sheet w wI GILE A. MEAD- XNVENTOR.

ATTORNEYS Dec. 26, 1967 G. A. MEAD 3,359,843

BLADE {XDJUSTING MECHANISMS FOR ROTARY PAPER CUTTERS Filed May 5, 1966 I 4 Sheets-Sheet 4 322 33I 323 3|? o d 330 3|4 l 342 f v 324 I 342 I 3|s v 'lll' 6 GILE A.MEAD

I NVENTOR.

ATTORNEYS United States Patent 3,359,843 BLADE ADJUSTING MECHANISMS FOR ROTARY PAPER CUTTERS Gile A. Mead, Hoquiam, Wash, assiguor t0 Lamb-Grays Harbor (10., Inc., Hoquiam, Wash. Filed May 5, 1966, Ser. No. 547,879 14 Claims. (Cl. 83-349) ABSTRACT OF THE DISCLOSURE Adjusting means employing relatively rotatable eccentric mounting assemblies permitting relative adjustment of a rotatable fly knife and a coacting knife blade. The adjusting means may operate on the ends of the fly knife mandrel, on the center of the mandrel, or on the coacting knife blade.

This application is a continuation-in-part of application S.N. 406,458, filed Oct. 26-, 1964, now abandoned.

This invention relates to paper cutters of the type which employ a rotary fly knife. Moreparticularly, this invention relates to mechanisms for adjusting the position of rotary fly knives which respect to a coacting blade.

Paper cutters employing rotary fly knives are commonly used to cut strips of fiber board, card board, pulp, as well as paper of various kinds, from sheet material continuously advanced through the paper cutter between the fly knife and a coacting knife blade. The cutting action is provided by rotating an elongated fly knife in close proximity to either a stationary or a rotating blade. The major problem encountered in these paper cutters is the difliculty in adjusting the relative positions of the rotary fly knife and the coacting blade to obtain a proper cutting action across the entire width of the sheet material advanced through the paper cutter.

Attempts to solve the problem in prior paper cutters resulted in fly knife adjusting mechanisms that could be used only when the paper cutter was stopped and the fly knife stationary. After adjustment, the paper cutter had to be restarted and the cutting action observed to ascertain whether a proper and suitable adjustment had been made. Use of this type of adjusting mechanism is undesirable because of the amount of paper cutter down time required to effect any adjustment and because of the inability to determine the adequacy of adjustment at the instant that the adjustment is made.

This problem is compounded when the sheet material to be cut is relatively thick or when several layers of sheet material are to be cut simultaneously or when the sheet material to be cut is extremely wideon the order of 200 inches or wider. When unusually thick or unusually wide sheet material is to be cut, the center portion of the fly knife will tend to deflect away from a coacting blade during a cutting action thereby producing an uneven cut. Attempts to solve this compounded problem in prior cutters resulted in fabricating supporting mandrels for fly knives with larger diameters and thicker shells to restrict fly knife deflection. Use of large diameter supporting mandrels, however prevents cutting the sheet material into relatively short sections because the large diameter mandrel prevents locating associated handling equipment for the cut sections close enough to the mandrel to pick up the relatively short sections.

A primary object of this invention is to provide for adjusting a rotary fly knife relative to a coacting blade While the fly knife is in motion. Another object is to provide such a means whereby the effect of fly knife adjustment can be ascertained as the adjustment is made. A further object is to provide means for independently adjusting the center portion and the ends of a fly knife 3,359,843 Patented Dec. 26, 1967 relative to a coacting blade while the fly knife is in motion. Another object is to permit the use of long fly knife mandrels of small diameter by employing such means to counteract fly knife deflection. Still another object is to provide means for adjusting a coacting blade relative to the rotary fly knife while the fly is in motion. These and other objects and advantages of this invention will become apparent from the following description in conjunction with the accompanying drawings, of which:

FIG. 1 is a top plan view of a paper cutter embodying the improvements of the present invention therein; a medial portion being removed to shorten the view;

FIG. 2 is an elevation of the paper cutter of FIG. 1 as seen from What is herein designated as. its idle end;

FIG. 3 is an enlarged cross sectional detail taken on line 3-3 in FIG. 1;

FIG. 4 is a vertical sectional detail taken on the line 4-4 in FIG. 2;

FIG. 5 is an enlarged sectional detail taken through an end bearing housing on line 55 in FIG. 2;

FIG. 6 is a schematic showing of an end housing and one of its contained eccentric bearing rings in which the trunnion of the fly knife mandrel is contained;

FIG. 7 is an elevation of the present cutter as seen from what is herein designated as its drive end;

FIG. 8 is an elevation view in cross section of the idle end of a fly knife mandrel illustrating another embodiment of this invention;

FIG. 9 is an end elevation view of another embodiment of this invention with an anvil blade and the arc of a fly knife shown in phantom;

FIG. 10 is a side elevation view of the FIG. 9 embodiment;

FIG. 11 is a cross section view taken along the line 11-11 in FIG. 9; and

FIG. 12 is a cross-section view taken along the line 1212 in FIG. 10.

This invention improves the adjustability of a paper cutter by providing a micrometer adjusting mechanism to support the section of the paper cutter to be adjusted. Exemplary paper cutter sections which could employ this micrometer adjusting mechanism include the ends and center sections of a fly knife mandrel, and the ends and center sections of a coating knife blade support. The adjusting mechanism comprises rotatable assembly means rotatable about a first axis and supporting means for mounting a paper cutter section having a second axis parallel and eccentric to the first axis. The rotatable assembly means and the supporting means are interrelated such that rotation of the rotatable assembly about the first axis will shift the second axis, and thus the supporting means, along an are on a radius defined by the eccentricity between the two axis.

When the section to be supported is itself rotatable, such as a fly knife mandrel, the adjusting mechanism is adapted to permit such rotation. In a preferred embodiment of such an adjusting mechanism, the rotatable assembly would comprise a rotatably adjustable bearing ring, and the supporting means would comprise a bearing assembly supportably connected to the fly cutter section and carried by the bearing ring in a manner such that the axis of the bearing assembly is slightly eccentric to the axis of the bearing ring. Thus, any rotatable adjustment of the bearing ring will cause the bearing assembly, and the paper cutter section supported thereby to shift position. FIGS. 1-7 illustrate one such embodiment wherein the ends of the rotatable fly knife mandrel are supported by adjusting mechanisms of this invention. FIG. 8 illustrates another embodiment wherein the end and center sections of a rotatable fly knife mandrel are supported by adjusting mechanisms of this invention.

In the embodiment shown in FIGS. 1-7, a fly knife mounting mandrel is shown equipped at its opposite ends with axially aligned mounting trunnions 11-11 which are rotatably supported by micrometer adjusting mechanisms 13-13. The mandrel 10 mounts one or more fly blades or knives F lengthwise thereon for coaction with a stationary anvil blade A that is mounted by a supporting base B as shown in FIGS. 1, 2 and 7. The adjusting mechanisms are contained in housings 14-14 which are disposed upon horizontal base bars 15-15 for horizontal shifting adjustment. The base bars 15-15 are of inverted channel formation and are mounted and fixed in parallel relationship on a base plate '16 as shown in FIGS. 2 and 7. The two end housings 14-14 are horiz'ontally adjusted by screws 42 and 43 shown in FIGS. 1, 2 and 7, that are mounted in plates 44 fixed to the base bars 15-15.

The housings 14-14 are one piece castings as shown in dash lines in FIG. 6. Each casting provides a bearing ring enclosing band, split at one side as at 17 in FIGS. 2 and 7. Each housing is provided with face plate 14 14f, as shown in FIG. 4, which mount bearing seals 12x-12x to retain lubricant within the housing.

Each micrometer adjusting mechanism comprises a bearing ring 18 of annular formation having inside and outside circumferences that are sl-ightly eccentric to each other as shown somewhat exaggerated in FIG. 7, the centers being designated at a for the outside circumference at b for the inside circumference. The bearing rings 18 are retained in their respective circular band-like enclosing housings 14 between the annular face plates 14 14 As shown in FIG. 4, these face plates are secured to opposite ends of the bearing rings 18 by bolts 14b. Each bearing ring 18 is seated On a suitable bushing 19 located on the lower portion of the housing 14.

Each bearing ring 18 is provided in its outside circumference with an encircling band of gear teeth 18! whereby it may be rotatably adjusted by turning a worm gear spindle 19 that is meshed therewith as shown in FIGS. 4 and 6. Spindle 19 is rotatably journaled in a horizontal position across the top edge and in the plane of bearing ring 18 within the top portion of housing 14. The adjustment of rings 18-18 is accomplished by turning the spindles 19 by means applied to wrench heads 46-46 at their outer ends to which the operator has easy and ready access.

The trunnions 11-11 extend through the housings 14- 14 and are supported within the inside circumference of the bearing rings 13-18 by bearing assemblies 12-12. These bearing assemblies permit the trunnions 11-11 to freely rotate, their axis of rotation corresponding to center point b in FIG. 7.

Each of the bearing ring housings 14-14 has paired clamping screws 35-35 applied through the end portions that are separated by the slits 17. These screws may be tightened for drawing the separated ends of each housing together, thus to clamp the enclosed band portion of each housing about the bearing ring to receive it in any position of rotary adjustment. When an adjustment is to be made, these clamping screws 35 are first loosened, the expanding tension of the housing being such that the slit 17 automatically opens with the loosening of the screws. The amount of slit opening is controlled by adjustment of locked cap screws 40 that are positioned between the paired clamping screws 35-35 through the ends of the housing at the splits 17 as shown in FIGS. 1 and 3. After loosening the clamping screws, the worm gear spindle 19 may be turned to rotate the respective bearing ring 18. Because of the eccentricity of the center points a and b, rotation of the ring about its center point a will cause the center point b to shift position along an arc in a radius defined by a line beween points a and b. Thus, in FIG. 7, rotation of the bearing ring 18 counterclockwise in FIG. 7 will shift the trunnion center point along an arc from point b to point a thereby raising the trunnion upward and to the left as shown somewhat exaggerated in FIG. 7. This shift in position would be employed to raise the cutting edge of the fly knife F along an identical arc upward and toward the cutting edge of anvil blade A, the anvil blade being located to the left of FIG. 7 as shown in FIG. 2.

A rough adjustment could be made by turning screws 42 and 43 to horizontally shift the housing 14-14 toward the anvil blade such that the fly knife was in close proximity thereto. Then the fine micrometer adjustment by adjusting mechanisms 13-13 would be made to accurately position the fly knife with respect to the anvil blade. The extent of micrometer adjustment that is made in the relationship of blades A and F may be noted by observing the extent of travel of marker plates 30 that are fixed to the outside faces of the face plates 14] as in FIGS. 2, 4 and 7 in reference to graduated blanks 31 fixed to the housing 14-14 also as shown in FIGS. 2, 4 and 7. Face plates 14 are bolted to bearing ring 18 and rotate therewith on bearing seals 12x and thus adjustment of the bearing rings 18 turns the plates 14] accordingly and the graduated blanks 31 remain stationary.

In practice, the amount of eccentricity between center points a and b is a small fraction of an inch so that the degree of adjustability is extremely fine, being on the order of 0.001 inch for each 0.25 inch of rotation of the bearing rings.

In the embodiment shown in FIG. 8 a cylindrical fly knife mounting mandrel in the form of a cylindrical tube, is rotatably supported at opposite ends in micrometer adjusting machanism 113. The center section is rotatably supported by a shaft 120 that extends through the mandrel 110 and is rotatably carried at its opposite ends in micrometer adjusting mechanisms 213. The essential components of the adjusting mechanisms 113 and 213 are substantially similar to the adjusting mechanism 13 and hence the same reference numerals in multiples of 100 and 200 are used to designate these substantially similar components. Reference to the discussion above of the components of the adjusting mechanism 13 can be had to ascertain the op eration of these similar components of the adjusting mechanism 113 and 213.

There are some differences between adjusting mechanisms 113 and 213 and adjusting mechanism 13 that are dictated by the concurrent use of two such adjusting mechanisms on each end of the fly knife-mandrel. The diameter of adjusting mechanism 113 is larger than that of adjusting mechanism 13 for mandrels of the same size because a reduced diameter trunnion, as at 11, cannot be employed when a shaft, as at 120, must extend through the mandrel. The two housings 114 and 214 on each mandrel end are separate units to permit independent clamping of the bearing rings 118 and 218. The face plates 114 and 214 and the bearing seals 112x and 212x may have different structures dictated by the use of two such adjusting mechanisms at each mandrel end. The housings 114 and 214 are adapted to be independently adjusted on bases and 215, respectively, in the manner disclosed in the FIGS. 1-7 embodiment.

The shaft 120 preferably is shrink-fitted to the interior of the mandrel center section to ensure that the shaft and the mandrel will act as a unit in the center section. The end sections of the shaft are of reduced diameter so that the only contact between the shaft and the mandrel is at the center section of each. The shaft is preferably tapered as shown up to its center section.

A major advantage of the use of two adjusting mechanisms on each mandrel end, over the use of one, exists where a combination of small mandrel diameter and relatively great mandrel length creates the problem of fly knife deflection at cutting speeds. This combination can occur where a small mandrel diameter is required to reduce costs, or to cut sheet material into short sections, or where a relatively long mandrel is required to handle wide sheet material. Either or both of the adjusting mech-t anisms or each end of the mandrel can be adjusted while the paper cutter is in operation.

FIGS. 9 to 12 depict a micrometer adjusting mechanism suitable for supporting a stationary blade. In FIG. 9 the section of an anvil and an anvil blade are shown in phantom and the arc traversed by the cutting edge of a fly knife is also shown in phantom. This embodiment of an adjusting mechanism comprises a housing 314, split at one side as at 317, in which a cylindrical bearing member 318 is rotatably mounted.

The housing is mounted on horizontal base bars 315- 315 for horizontal shifting adjustment. These base bars are of inverted channel formation and mounted and fixed in parallel relationship on a base plate 316. The housing is horizontally adjusted by screws 342 and 343 that are mounted in plates 344 fixed to the base plates 316.

The bearing member 318 is provided with an encircling band of gear teeth 318t whereby it may be rotatably adjusted by turning a worm gear spindle 319 that is meshed therewith. Spindle 319 is rotatably journalled in a horizontal position across the bottom edge and in the plane of the gear teeth 318i within the bottom portion of housing 314. The adjustment of bearing member 318 is accomplished by turning spindle 319 by means applied to wrench head 346 at its outer end.

Cylindrical stub shafts 321-321 extend from each end of the bearing member 318 and are preferably integral therewith. The axis of these stub shafts are in alignment and are slightly eccentric of the axis of the bearing member 318, as shown somewhat exaggerated in FIG. 9, the centers being designated at d for the bearing member and at e for the stub shafts. An anvil support member 322 is mounted on the stub shafts by pillow blocks 323-323 and stands above the housing 314. The upper halves of the pillow blocks are integral with the anvil support member 322 and the lower halves of the pillow blocks are bolted to the respective other halves by bolts 324.

The housing 318 has paired clamping screws 325 applied through the end portions that are separated by slit 317. These screws may be tightened for drawing the separated ends of the housing together, thus to clamp the housing about the bearing member to secure it in any position of rotary adjustment. When an adjustment is to be made, these clamping screws 335 are first loosened, the expanding tension of the housing being such that the slit 317 automatically opens with the loosening of the screws. After loosening the clamping screws, the worm gear spindle 319 may be turned to rotate the bearing member 318. Because of the eccentricity of the axis of the bearing member and the stub shafts, rotation of the bearing member about its axis d will cause the axis 2 of the stub shaft to shift position along an are on a radius defined by a line between points d and e, and hence to shift the anvil and anvil blade supported on the anvil support member along an identical arc.

A rough adjustment could be made by turning screws 342 and 343 to horizontal shift the housing 314 toward the fly knife mandrel. Then the fine micrometer adjustment would be made to accurately position the anvil blade with respect to the fly knife. The extent of the micrometer adjustment that is made may be noted by observing the extent of travel of a marker plate 330 that is fixed to the end of one of the stub shafts in reference to graduated blanks 31 fixed to the outside face of one of the saddle blocks.

In practice, the amounts of eccentricity between the center points d and e is a small fraction of an inch so that the degree of adjustability is extremely fine.

The anvil adjusting mechanism can be employed to support the ends of the anvil blade and also to support the anvil blade at points between the ends. Use of adjusting mechanisms at such intermediate points could be used in conjunction with the use of adjusting mechanisms on the fly knife mandrel, and might supplant their use on a fly knife mandrel under some paper cutting conditions.

It is believed that the invention will have been clearly understood from the foregoing detailed description of my now-preferred illustrated embodiment. Changes in the details of construction may be resorted to without departing from the spirit of the invention and it is accordingly my intention that no limitations be implied and that the hereto annexed claims be given the broadest interpretation to which the employed language fairly admits.

What is claimed is:

1. In a paper cutter having a knife blade, a rotatable mandrel and a fly knife mounted on said mandrel for cutting co-action with said knife blade for cutting sheet material passed between said fly knife and said knife blade, the improvement comprising adjusting means supporting a section of said paper cutter for adjusting the relative positions of said fly knife and said knife blade with respect to each other; said adjusting means comprising rotatable assembly means rotatable about a first axis, and supporting means for mounting the paper cutter section having a second axis parallel and eccentric to said first axis, said rotatable assembly means and said supporting means being interrelated such that rotation of said rotatable assembly about said first axis causes said second axis to shift position along an arc on a radius defined by the eccentricity between the two axis; said knife blade comprising a stationary anvil blade; and said a'djusting means being adapted to support a section of said anvil blade and comprises a rotatably adjustable cylindrical bearing member, a cylindrical support member connected to and extending from each end of said bearing member and having aligned axis parallel to and slightly eccentric to the bearing member axis, means for mounting said anvil blade on said support members, and mean for rotatably adjusting said bearing member.

2. A paper cutter comprising a base, a pair of laterally spaced housings mounted on said base, an anvil blade fixedly mounted between said housings, a rotatably driven mandrel extended between said housings and having mounting trunnions at its ends rotatably supported therein; a fly blade mounted on the mandrel for co-action with the anvil blade for cutting strips of paper passed between said blades, paired bearing rings rotatably fitted in said housings in axial alignment, bearing assemblies mounting the trunnions of said mandrel equally eccentrically in said bearing rings and means mounted in said housings for rotatably adjusting said bearing rings thus to adjust the fly blade relative to the anvil blade for paper cutting.

3. A paper cutter according to claim 2 wherein said ring bearings are exteriorly formed with worm threads; and including a ring adjusting worm shaft mounted in each housing in driving mesh with the threads of the corresponding bearing ring and adapted to be rotated for adjusting the corresponding ring to establish blade shearing relationship.

4. A paper cutter according to claim 2 wherein each housing is of band-like formation to enclose the bearing ring for rotative adjustment: and wherein said band is split radially at one side of the circular bearing containing opening thereof; and including a clamping screw applied through the radial split of each housing to tighten the band against the bearing ring to retain bearing ring adjustment.

5. A paper cutter according to claim 2 wherein the bearing rings are rotatably contained in their respective housings, have cover plates fixedly applied to opposite faces of the housings about the ring containing openings; said cover plates having openings passing the trunnions therethrough for rotation of the mandrel and rotatably adjustable with the rings to which they are attached; the ring enclosing portions of the housings having graduations applied thereto, and a pointer applied to cover plate to move along the graduations in accordance with ring adjustment to visually indicate the adjustment of blade relationship thereby made.

6. A paper cutter according to claim 2 wherein said mandrel is cylindrical; and including a shaft extending through said mandrel and having an enlarged center section in contact with the center section of said mandrel; a second pair of housings and a second set of paired bearing rings rotatably fitted in said second pair of housings in axial alignment, at second pair of bearing assemblies mounting the ends of said shaft equally eccentrically in said second pair of bearing rings, and means mounted in said second pair of housings for rotatably adjusting said second pair of bearing rings to adjust the center section of the fly blade relative to the anvil blade for paper cutting.

7. A paper cutter according to claim 6 wherein said second set of bearing rings are exteriorly formed with worm threads; and including a ring adjusting worm shaft mounted in each second housing in driving mesh with the threads of the corresponding second bearing ring and adapted to be rotated for adjusting the corresponding ring to establish blade shearing relationship.

8. A paper cutter according to claim 6 wherein each second housing is a band-like formation to enclose the bearing ring for rotative adjustment and wherein said band is split radially at one side of the circular bearing containing opening thereof; and including a clamping screw pplied through the radial spilt of each second housing to tighten the band against the bearing ring to retain bearing ring adjustment.

9. A paper cutter according to claim 6 wherein the second bearing rings, as rotatably contained in their respective housings, have cover plates fixedly applied to opposite faces thereof with peripheral edges slidably overlapped with faces of the second housings about the ring containing openings; said cover plates having openings passing said shaft and rotatably adjustable with the rings to which they are attached; the ring enclosing portions of the second housings having graduations applied thereto, and a pointer applied to a cover plate to move along the graduations in accordance with ring adjustment to visually indicate the adjustment in blade relationship thereby made.

10. A paper cutter according to claim 1, including a housing; and wherein said bearing member is rotatably fitted in said housing and exteriorly formed with worm threads; and wherein said means for rotatably adjusting said bearing member comprises an adjusting worm shaft mounted in said housing in driving mesh with the threads of said bearing member.

11. A paper cutter according to claim 1 wherein said means for mounting said anvil blade comprise an anvil support member, and pillow blocks connected to said anvil support member and mounted on said support members.

12. A paper cutter according to claim 11 wherein one of said pillow blocks has graduations applied thereto; and including a pointer attached to the end of the corresponding support member to move along the graduations in accordance with bearing member adjustment.

' 13. A paper cutter comprising a base; a first pair of laterally spaced housings mounted on said base; an anvil blade between the first housings; a rotatably driven cylindrical mandrel extending between said first housings; a fiy blade mounted on the mandrel for co-action with the anvil blade for cutting strips of paper passed between the blades; paired bearing rings rotatably fitted in said first housings in axial alignment; first bearing assemblies mounting the ends of said mandrel equally eccentrically in said bearing rings; first means mounted in said first housings for rotatably adjusting said bearing rings thus to adjust the ends of said fly blade relative to the anvil blade for paper cutting; a shaft extending through said mandrel and having an enlarged center section in contact with the center section of said mandrel; a second pair of housings and a second set of paired bearing rings rotatably fitted in said second pair of housings in axial alignment; a second pair of bearing assemblies mounting the ends of said shaft equally eccentrically in said second pair of bearing rings; second means mounted in said second pair of housings for rotatably adjusting said second pair of bearing rings to adjust the center section of the fly blade relative to the anvil blade for paper cutting; adjusting means adapted to support a section of said anvil blade comprising a rotatably adjustable cylindrical bearing member, a cylindrical support member connected to and extending from each end of said bearing member and having aligned axis parallel to and slightly eccentric to the bearing member axis, means for rotatably adjusting said bearing member.

14. In a paper cutter having a knife blade, a rotatable cylindrical mandrel and a fly knife mounted on said mandrel for cutting co-action with said knife 'blade for cutting sheet material passed between said fly knife and said knife blade, the improvement comprising a shaft extending axially into said mandrel and having an enlarged section connected to the mandrel center section; adjusting means supporting a section of said shaft for adjusting the relative positions of said fly knife and said knife blade with respect to each other, comprising a rotatably adjustable bearing ring, and a bearing assembly supportably connected to said shaft and carried by said bearing ring in a manner such that the axis of said bearing assembly is slightly eccentric and parallel to the axis of said bearing ring, and means for rotatably adjusting said bearing ring; and means rotatably mounting the ends of the cylindrical mandrel independently of said adjusting means.

References Cited UNITED STATES PATENTS 2,100,930 11/1937 Aiken 83-349 X 2,397,603 4/1946 Hackett 83-344 X 2,711,935 6/1955 Miles 30862 ANDREW R. JUHASZ, Primary Examiner.

Claims (1)

1. IN A PAPER CUTTER HAVING A KNIFE BLADE, A ROTATABLE MANDREL AND A FLY KNIFE MOUNTED ON SAID MANDREL FOR CUTTING CO-ACTION WITH SAID KNIFE BLADE FOR CUTTING SHEET MATERIAL PASSED BETWEEN SAID FLY KNIFE AND SAID KNIFE BLADE, THE IMPROVEMENT COMPRISING ADJUSTING MEANS SUPPORTING A SECTION OF SAID PAPER CUTTER FOR ADJUSTING THE RELATIVE POSITIONS OF SAID FLY KNIFE AND SAID KNIFE BLADE WITH RESPECT TO EACH OTHER; SAID ADJUSTING MEANS COMPRISING ROTATABLE ASSEMBLY MEANS ROTATABLE ABOUT A FIRST AXIS, AND SUPPORTING MEANS FOR MOUNTING THE PAPER CUTTER SECTION HAVING A SECOND AXIS PARALLEL AND ECCENTRIC TO SAID FIRST AXIS, SAID ROTATABLE ASSEMBLY MEANS AND SAID SUPPORTING MEANS BEING INTERRELATED SUCH THAT ROTATION OF SAID ROTATABLE ASSEMBLY ABOUT SAID FIRST AXIS CAUSES SAID SECOND AXIS TO SHIFT POSITION ALONG AN ARC ON A RADIUS DEFINED BY THE ECCENTRICITY BETWEEN THE TWO AXIS; SAID KNIFE BLADE COMPRISING A STATIONARY ANVIL BLADE; AND SAID ADJUSTING MEANS BEING ADAPTED TO SUPPORT A SECTION OF SAID ANVIL BLADE AND COMPRISES A ROTATABLY ADJUSTABLEE CYLINDRICAL BEARING MEMBER, A CYLINDRICAL SUPPORT MEMBER CONNECTED TO AND EXTENDING FROM EACH END OF SAID BEARING MEMBER AND HAVING ALIGNED AXIS PARALLEL TO AND SLIGHTLY ECCENTRIC TO THE BEARING MEMBER AXIS, MEANS FOR MOUNTING SAID ANVIL BLADE ON SAID SUPPORT MEMBERS, AND MEANS FOR ROTATABLY ADJUSTING SAID BEARING MEMBER.

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